Table of Contents

Andrew Sowers's fall2012 Opus

Who is John Galt?

Introduction

Since personal introductions are out of the way I'll introduce my intention of requesting an independent study for the Fall 2012 semester. It isn't out of arrogance or pride, I genuinely desire to grasp the fundamentals of C, C++ and maybe even touch objective c if time permits?(pun totally intended) So I'll begin researching concepts immediately and await your instruction. Haas, I'm very excited for what's ahead. Also data communication sounds like there's the opportunity for a lot fun. The proprietary LAIR alert system sounds feasible and practical! Can't wait to get going with it.

Part 1

Entries

Entry 1: August 28, 2012

Today I began reading on good old wikipedia about the different compilers I could choose from, I found the following options.

  1. Ch - compatible on virtually all platforms is open source. Ch also has an Integrated Development Environment for 'improved' workflow.
  2. GCC - What I've familiarized myself with and will most likely be using most this semester.
  3. Icc - A compiler thats source is open for non-commercial use. Icc has a windows only IDE, which is no help to me…
  4. PGCC - Part of visual studio on windows.

Entry 2: September 25, 2012

Impressions of Freeswitch

From what I've read about FreeSWITCH is that it's relatively new (as of 2006) and is a softswitch communicator that interfaces with both physical and digital phones. It's built on open source technologies like SQLight and Apache. FreeSWITCH accepts an array of protocols such as VOIP, SIP, Google Talk and many more to interface with and supports a wide array of audio codecs.

Here are some of the more important configuration file fore FreeSWITCH:

On our datacom server, FreeSWITCH is located in '/usr/local/freeswitch' and includes the following directories in its base:

[root@dhcp-171 freeswitch]# ls
bin  conf  db  grammar	htdocs	include  lib  log  mod	recordings  run  scripts  sounds  storage
[root@dhcp-171 freeswitch]# 

Bin holds the various executables that are the core of freeswitch, conf holds configuration files that some genius wrote in xml to sort in some ridiculous hierarchical model.

There are other meta items like FreeSWITCH's library and scripts.

Entry 3: August Day, 2012

This is a sample format for a dated entry. Please substitute the actual date for “Month Day, Year”, and duplicate the level 4 heading to make additional entries.

As an aid, feel free to use the following questions to help you generate content for your entries:

  • What action or concept of significance, as related to the course, did you experience on this date?
  • Why was this significant?
  • What concepts are you dealing with that may not make perfect sense?
  • What challenges are you facing with respect to the course?

Remember that 4 is just the minimum number of entries. Feel free to have more.

Entry 4: August Day, 2012

This is a sample format for a dated entry. Please substitute the actual date for “Month Day, Year”, and duplicate the level 4 heading to make additional entries.

As an aid, feel free to use the following questions to help you generate content for your entries:

  • What action or concept of significance, as related to the course, did you experience on this date?
  • Why was this significant?
  • What concepts are you dealing with that may not make perfect sense?
  • What challenges are you facing with respect to the course?

Remember that 4 is just the minimum number of entries. Feel free to have more.

Keywords

cprog Keyword 1

Identification of chosen keyword.

Functions

All programs contain at least a main() function. The main()function typically is executed when the program starts. functions contain parameters or instructions to be used during the programs computation. Here is an example of a function parameter:

long sum( int array[], int number ) // Identifiers
 
{                                   //body of function
 
  int i;
 
  long result = 0;       
 
 
 
  for( i = 0;  i < number;  ++i )
 
     result += (long)array[i];
 
  return result;
 
}

Functions can also have declarations before the body where you can call datatypes.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

cprog Keyword 1 Phase 2

Identification of chosen keyword.

Definition

Structs, not your mama's sneaker shoes.

Example

#include <stdio.h>
#include <stdlib.h>
 
struct mystruct {                 //
    int test;                     // Declaration of initial struct.
};                                //
 
typedef struct mystruct * newstruct;                                    // newstruct function is a pointer to my struct.
 
newstruct getnewstruct() {
    newstruct temp = (newstruct)malloc(sizeof(newstruct*)) ;
    return temp;
}
 
int main()
{
    newstruct tester = getnewstruct() ;                  //
    tester -> test = 8;                                  // Mathematical manipulation and printing of structure.
    tester -> test++;                                    //
    printf ("The value is %i\n",tester -> test) ;        //
    free(tester) ;
    return 0;
}

Demonstration

Demonstration of the indicated keyword.

If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:

Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:

andrew ~ $ gcc malloc.c -o malloc
andrew ~ $ ./malloc
First value: 10
Pi is: 3.140000

datacomm Keyword 1

Identification of chosen keyword.

Definition

Definition (in your own words) of the chosen keyword.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

datacomm Keyword 1 Phase 2

asterisk

Definition

A programming language to communicate and execute the basic functions of telephony services.

Demonstration

'extensions.conf' located in '/etc/asterisk/extensions.conf' maintains a bulk of the configurations options for the asterisk service including your dial plan and how inbound/outbound calls are routed. Example of an extension:

exten => 602,1,Dial(SIP/Andrew,20)
exten => 602,n,VoiceMail(602@vm,u)

'sip.conf' located in '/etc/asterisk/sip.conf' maintains the users locations and affiliation to the asterisk server. Example of a sip.conf user entry:

[Andrew]
type=friend
secret=123456
host=dynamic
context=users
deny=0.0.0.0/0
permit=10.80.2.0/255.255.255.0
mailbox=778@vm

Experiment 1

Question

Can you include the main() of a program in a header file?

Resources

Hypothesis

I suspect that you can include any function within a header file and call it. Including main().

Then call it like so:

main();

Experiment

I'm going to take the main portion of the encipher program from project two and place it into main.h

int main(int argc, char **argv)
{
 
 
	printf("Greetings, Agent Haas.\n");
	FILE *in, *out;
 
	int cipher;
	int key;
 
	in = fopen("plain.txt", "r");
	out = fopen("enciphered.txt", "w");
 
	if(argv[1] == NULL)
 
		{
        		printf("\nNo argument provided, execute with key argument.\nexample: ./encipher 1\n");
        		exit(1);
    		}
 
	char *plain;
	plain = (char*) malloc (sizeof(char) * 127);
	int count = 0;
 
	if(in == NULL)
		{
        		printf("\nFile empty, enter some text to encipher\n");
        		fgets(plain, 127, stdin);
 
        	while(plain[count] != '\0')
        		{
 
        			count = count+1;
        		}
 
        	int cipher = atoi(argv[1]);
        	count = 0;
 
        	while(plain[count] != '\0')
        		{
            			key = 1;
 
            			if(plain[count] >= 65 && plain[count] <= 90)
            				{
                				key = plain[count] + cipher;
 
                					while(key > 90)
                						{
                    							key = key - 26;
                						}
            				}
 
            			if(plain[count] >= 97 && plain[count] <= 122)
            				{
                				key = plain[count] + cipher;
 
	               					while(key > 122)
                						{
                    							key = key - 26;
                						}
            				}
            			if(key == 1)
            				{
                				key = 32;
            				}
 
            			fprintf(out, "%c", key);
            			count = count+1;
        		}
 
        	printf("\nEnciphered text is loated in enciphered.txt\n");
printf ("It took me %d clicks (%f seconds).\n",t,((float)t)/CLOCKS_PER_SEC);
 
	}
 
    else
	{
        	fgets(plain, 127, in);
        	printf("\nText before cipherication: ");
        	while(plain[count] != '\0')
        		{
        			printf("%c", plain[count]);
				count = count+1;
        		}
        	int cipher = atoi(argv[1]);
        	count = 0;
		printf("\nCiphered text output: ");
        	while(plain[count] != '\0')
        		{
            			key = 1;
				if(plain[count] >= 65 && plain[count] <= 90)
        				{
                				key = plain[count] + cipher;
                				while(key > 90)
            						{
                    						key = key - 26;
            						}
         				}
 
               			if(plain[count] >= 97 && plain[count] <= 122)
      	 				{
                				key = plain[count] + cipher;
                				while(key > 122)
                					{
                						key = key - 26;
                					}
         				}
               			if(key == 1)
         				{
                				key = 32;
         				}
				printf("%c", key);
				fprintf(out, "%c", key);
				count = count+1;
	 		}
 
 
		fclose(in);
		fclose(out);
	    return (0);
	}
 
}

Data

Here's main.h:

#ifndef _MAIN_H
#define _MAIN_H
 
 
int main(int argc, char **argv)
{
int t;
  t = clock();
 
	printf("Greetings, Agent Haas.\n");
	FILE *in, *out;
 
	int cipher;
	int key;
 
	in = fopen("plain.txt", "r");
	out = fopen("enciphered.txt", "w");
 
	if(argv[1] == NULL)
 
		{
        		printf("\nNo argument provided, execute with key argument.\nexample: ./encipher 1\n");
        		exit(1);
    		}
 
	char *plain;
	plain = (char*) malloc (sizeof(char) * 127);
	int count = 0;
 
	if(in == NULL)
		{
        		printf("\nFile empty, enter some text to encipher\n");
        		fgets(plain, 127, stdin);
 
        	while(plain[count] != '\0')
        		{
 
        			count = count+1;
        		}
 
        	int cipher = atoi(argv[1]);
        	count = 0;
 
        	while(plain[count] != '\0')
        		{
            			key = 1;
 
            			if(plain[count] >= 65 && plain[count] <= 90)
            				{
                				key = plain[count] + cipher;
 
                					while(key > 90)
                						{
                    							key = key - 26;
                						}
            				}
 
            			if(plain[count] >= 97 && plain[count] <= 122)
            				{
                				key = plain[count] + cipher;
 
	               					while(key > 122)
                						{
                    							key = key - 26;
                						}
            				}
            			if(key == 1)
            				{
                				key = 32;
            				}
 
            			fprintf(out, "%c", key);
            			count = count+1;
        		}
 
        	printf("\nEnciphered text is loated in enciphered.txt\n");
printf ("It took me %d clicks (%f seconds).\n",t,((float)t)/CLOCKS_PER_SEC);
 
	}
 
    else
	{
        	fgets(plain, 127, in);
        	printf("\nText before cipherication: ");
        	while(plain[count] != '\0')
        		{
        			printf("%c", plain[count]);
				count = count+1;
        		}
        	int cipher = atoi(argv[1]);
        	count = 0;
		printf("\nCiphered text output: ");
        	while(plain[count] != '\0')
        		{
            			key = 1;
				if(plain[count] >= 65 && plain[count] <= 90)
        				{
                				key = plain[count] + cipher;
                				while(key > 90)
            						{
                    						key = key - 26;
            						}
         				}
 
               			if(plain[count] >= 97 && plain[count] <= 122)
      	 				{
                				key = plain[count] + cipher;
                				while(key > 122)
                					{
                						key = key - 26;
                					}
         				}
               			if(key == 1)
         				{
                				key = 32;
         				}
				printf("%c", key);
				fprintf(out, "%c", key);
				count = count+1;
	 		}
		printf("\nEnciphered text is located in enciphered.txt\n\n");
printf ("It took me %d clicks (%f seconds).\n",t,((float)t)/CLOCKS_PER_SEC);
 
		fclose(in);
		fclose(out);
	    return (0);
	}
 
}
 
#endif

Here's the modified program:

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include "main.h"
 
main();

And the gcc output:

lab46:~/src/cprog/cipher$ gcc encipher.c -o encipher
encipher.c:20: warning: data definition has no type or storage class
lab46:~/src/cprog/cipher$ 

Got a warning, but it worked.

Analysis

Based on the data collected:

  • My hypothesis was indeed correct.
  • My hypothesis halfway applicable, I have to explore the repercussions of the error.

Conclusions

Header files are a brilliant way to break up ANY function in a program to allow more readable code and FAR better organization.

Part 2

Entries

Entry 1: October 3, 2012

Today we figured out how to call system tasks using nothing but the asterisk extensions.conf file.

To add an extension executes a script you simply need to add “System(pathtoscript.sh)”

In practice this would look like this:

exten => 607,1,Answer
exten => 607,2,Wait(1)
exten => 607,3,System(path/to/script.sh) ;make sure to place in writable path for asterisk user
exten => 607,4,Hangup()

This opens a plethora of new possibilities that we'll explore in the coming weeks!

Entry 2: October 7, 2012

Today I've decided to start researching the implications of installing PBX and Asterisk on my Raspberry Pi. My ultimate goal would be initiating a house appliance by literally calling it through asterisk. Smart appliances here I come! =D I'm starting my research here:

UPDATE! FreePBX is loaded and I've setup some extensions. Now I'll be looking into some ip appliances for automation.

Entry 3: October 31, 2012

Finding direction in Data Com

With everyone moving into their individual projects I'm at as loss with what to do. Hoping we can establish a tangible direction some time soon.

Entry 4: October Day, 2012

This is a sample format for a dated entry. Please substitute the actual date for “Month Day, Year”, and duplicate the level 4 heading to make additional entries.

As an aid, feel free to use the following questions to help you generate content for your entries:

  • What action or concept of significance, as related to the course, did you experience on this date?
  • Why was this significant?
  • What concepts are you dealing with that may not make perfect sense?
  • What challenges are you facing with respect to the course?

Remember that 4 is just the minimum number of entries. Feel free to have more.

Keywords

cprog Keyword 2

Identification of chosen keyword.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

cprog Keyword 2 Phase 2

Identification of chosen keyword.

Arrays

Arrays are buckets or memory locations that group similar integers or character strings.

Arrays can be manipulated to hold different values of any datatype as long as that datatype is consistant across the entire array. You can even copy the contents of one array to another!

Example:

#include<stdio.h>
int main()
{
int array [5];
int i;
short onethroughfive [5];
array[0] = 45;
array[1] = 56;
array[2] = 34;
array[3] = 42;
array[4] = 32;
for(i=0; i<5; i++){
    *(onethroughfive+i)=*(array+i);
}
for (i=0; i<5; i++){
   printf("%d\n", *(onethroughfive+i));
}
return (0);
}

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

datacomm Keyword 2

Identification of chosen keyword.

Raspberry Pi GPIO Programming

The Raspberry Pi hosts a General Purpose Input Output board for interfacing with low level peripherals. Dragon.net was nice enough to write a detailed C library for the GPIO to make electronics programming super easy! Here's an example of a program that turns on and off an LED:

/*
 * blink.c:
 *      Simple test program to blink an LED on pin 7
 */
 
#include <wiringPi.h>
#include <stdio.h>
 
int main (void)
{
  int pin = 7;
  printf("Raspberry Pi wiringPi blink test\n");
 
  if (wiringPiSetup() == -1)
    exit (1);
 
  pinMode(pin, OUTPUT);
 
  for (;;){
    printf("LED On\n");
    digitalWrite(pin, 1);
    delay(250);
    printf("LED Off\n");
    digitalWrite(pin, 0);
    delay(250);
  }
 
  return 0;
}

by way of this reference I hope to setup a simple c application using a solid state relay for my future automated “Dial a Coffee” via Asterisk and Pi ingenuity:http://elinux.org/RPi_Low-level_peripherals#GPIO_Driving_Example_.28C.29

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

datacomm Keyword 2 Phase 2

Identification of chosen keyword.

Lair Brew

A simple program that operates a relay switch that supplies electricity for delicious caffeinated beverages.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Tom's mom

Demonstration

/*
Lair_Brew ~ Caffeine ~
Version 0.2
*/
 
#include <wiringPi.h>
#include <stdio.h>
 
void loopback(void)
{
    char ch;
    ch = getchar();
    while( ch != '\n' ) ch = getchar();
}
 
int main (void)
{
    int pin = 7;
    char ch;
    int exit_flag = 0;
    printf("welcome to Lair Brew\n");
 
  if (wiringPiSetup() == -1) return(1);
 
    pinMode(pin, OUTPUT);
    printf("Brew on\n");
    digitalWrite(pin, 1);
 
 while( exit_flag  == 0 ) {
    printf("Wish to exit? (Y)\n");
    scanf(" %c", &ch );
    ch = toupper( ch );
 
 if((ch == 'Y')){
    printf("\nBrew Off\n");
    digitalWrite(pin, 0);
    delay(250);
    printf("\nEnjoy Your Coffee, Sir!\n");
  }
  else {
    printf("\nType (y) to exit.\n");
    loopback();
  }
   if( ch == 'Y' ) exit_flag = 1;
  }
 
  return 0;
}

The program is loaded into /etc/asterisk/extensions.conf like so:

exten => 607,1,Answer
exten => 607,2,Wait(1)
exten => 607,3,System(/tmp/Lair_brew_auto)
exten => 607,4,Hangup()

Experiment 2

Question

Can you include the main() of a program in a header file?

Resources

Collect information and resources (such as URLs of web resources), and comment on knowledge obtained that you think will provide useful background information to aid in performing the experiment.

Hypothesis

Based on what you've read with respect to your original posed question, what do you think will be the result of your experiment (ie an educated guess based on the facts known). This is done before actually performing the experiment.

State your rationale.

Experiment

How are you going to test your hypothesis? What is the structure of your experiment?

Data

Perform your experiment, and collect/document the results here.

Analysis

Based on the data collected:

  • Was your hypothesis correct?
  • Was your hypothesis not applicable?
  • Is there more going on than you originally thought? (shortcomings in hypothesis)
  • What shortcomings might there be in your experiment?
  • What shortcomings might there be in your data?

Conclusions

What can you ascertain based on the experiment performed and data collected? Document your findings here; make a statement as to any discoveries you've made.

Part 3

Entries

Entry 1: November 20, 2012

At this point I'm nearly done with bignum, all that is needed is the multiplication function along with some minor tweaking. I hope to complete it before the end of break.

Entry 2: November 24, 2012

Today I've looked into some extensive research:(http://math.berkeley.edu/~jakub/pdf/kominiarczuk2004.pdf) regarding tin-can phones. In order to receive higher quality connection I propose we build a box apparatus around our speaker and microphone setups. Also, the fishing line will most likely produce the greatest result with identical plastic cups rather than cans due to their membranes ability to vibrate easily. Finally the tension. Section D discuses frequency of waves in relation to tension. Essentially, to tight is just as bad as too loose. (that's what he said.)

I hope we can put this information to use on Tuesday Dec 4.

Entry 3: November 25, 2012

today for data comm, I've started research on network programming with a a focus in C to be reinvent to my independent study. I plan on spending a better part of this day going over this page: http://shoe.bocks.com/net/

My hope is to build network status LED via the GPIO on my Raspberry Pi

Entry 4: November 30, 2012

Out with my girlfriend Dana and some friends at Ithaca College. We were paying a game called “Power Hour”(Google is your friend) I decided that instead of keeping track of the time, why not write a simple program to do this for us? I came up with the following:

#include <time.h>
#include <stdio.h>
int main()
{
printf("\a");
for (;;)
        {
        printf("begin minute\n");
        sleep(60);
        printf("BEEP\a\n");
        }
}

Having lots of funnnn =)

UPDATE: After looking over what I had done last night I realized there was huge room for improvement. Here's the update:

#include <stdio.h>
#include <time.h>
 
int main()
{
        printf("Begin power hour!\n\a");
        int i;
        for(i = 0; i <= 60; ++i)
        {
                printf("Minute Number: %d\n",i);
                sleep(60);
                printf("Drink!\n\a");
        }
        return 0;
}

Keywords

cprog Keyword 3

Identification of chosen keyword.

Malloc

Malloc uses blocks of memory and pointers to perform operations. In the following program we declare the struct RECORD, fill it with datatypes, and point to it. malloc lets us output the individual blocks of RECORD we defined to stdout.

#include<stdio.h>
 
        typedef struct rec
        {
                int i;
                float PI;
                char A;
        }RECORD;
 
        int main()
        {
                RECORD *point;
 
                point = (RECORD *) malloc (sizeof(RECORD));
 
                point->i = 10;
                point->PI = 3.14;
                point->A = 'a';
 
                printf("First value: %d\n", point->i);
                printf("Pi is: %f\n", point->PI);
                printf("Third value: %c\n", point->A);
 
                free(point);
 
                return 0;
        }

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

cprog Keyword 3 Phase 2

Identification of chosen keyword.

Malloc

Malloc uses blocks of memory and pointers to perform operations. In the following program we declare the struct RECORD, fill it with datatypes, and point to it. malloc lets us output the individual blocks of RECORD we defined to stdout.

#include<stdio.h>
 
        typedef struct rec
        {
                int i;
                float PI;
                char A;
        }RECORD;
 
        int main()
        {
                RECORD *point;
 
                point = (RECORD *) malloc (sizeof(RECORD));
 
                point->i = 10;
                point->PI = 3.14;
                point->A = 'a';
 
                printf("First value: %d\n", point->i);
                printf("Pi is: %f\n", point->PI);
                printf("Third value: %c\n", point->A);
 
                free(point);
 
                return 0;
        }

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

Demonstration

Demonstration of the indicated keyword.

If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:

#include<stdio.h>
 
        typedef struct rec
        {
                int i;
                float PI;
                char A;
        }RECORD;
 
        int main()
        {
                RECORD *point;
 
                point = (RECORD *) malloc (sizeof(RECORD));
 
                point->i = 10;
                point->PI = 3.14;
                point->A = 'a';
 
                printf("First value: %d\n", point->i);
                printf("Pi is: %f\n", point->PI);
                printf("Third value: %c\n", point->A);
 
                free(point);
 
                return 0;
        }

Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:

andrew ~ $ nano -c malloc.c
andrew ~ $ gcc malloc.c -o malloc
andrew ~ $ ./malloc
First value: 10
Pi is: 3.140000
Third value: a
andrew ~ $ 

datacomm Keyword 3

Identification of chosen keyword.

Minimodem

Minimodem is a linux command line utility that generates modem tones. It works over different modem protocols. to use minimoddem you want to set it to transmit or receive and set the bit rate. Example:

andrew ~/ls |minimodem -t "200"

minimodem will pass the result of the ls to transmit via minimodem at a bit rate of 200. the receiveing end would simply change -t to -r and pass it into a file.

The audio output of minimodem can travel over any acceptable medium. Even cup and string! (if implemented properly)

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

datacomm Keyword 3 Phase 2

Identification of chosen keyword.

Definition

Definition (in your own words) of the chosen keyword.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

  • Reference 1
  • Reference 2
  • Reference 3

Demonstration

Demonstration of the indicated keyword.

If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:

/*
 * Sample code block
 */
#include <stdio.h>
 
int main()
{
    return(0);
}

Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:

lab46:~$ cd src
lab46:~/src$ gcc -o hello hello.c
lab46:~/src$ ./hello
Hello, World!
lab46:~/src$ 

Experiment 3

Question

Can I declare all my datatypes in a struct and alias them in main?

Resources

Hypothesis

I believe that it will be possible to declare all my datatypes in a simple structure and call them in main.

Experiment

I've built a simple program that calls three integers and one character array that I will use as a base for my experiment.

#include <stdio.h>
#include <string.h>
 
int main()
{
        int a = 1;
        int b = 2;
        int c = 3;
        char abc[] = "abc";
        printf("Now I know my %s's, they are easy as %d, %d, %d\n", abc, a, b, c);
        return 0;
}

Program modified with struct:

#include <stdio.h>
#include <string.h>
 
typedef struct {
        int a;
        int b;
        int c;
        char abc[];
        }node;
 
int main()
{
        node n;
        n.a = 1;
        n.b = 2;
        n.c = 3;
        strcpy(n.abc, "abc");
        printf("Now I know my %s's, they are easy as %d, %d, %d\n", n.abc, n.a, n.b, n.c);
        return 0;
}

Data

By declaring variables with their assigned datatype in the typedef struct, you can call the variable with an alias to that struct without setting the datatype in that function.

Analysis

Based on the data collected:

  • My hypothesis was correct.
  • my hypothesis was applicable.

Conclusions

What can you ascertain based on the experiment performed and data collected? Document your findings here; make a statement as to any discoveries you've made.