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Table of Contents
Part 3
Entries
Entry 9: 4/3/2012
we have been doing some multi- file program examples in class. Doing multi file programs keep your code more organized. It takes longer and uses more over head to use muli-file programs.
- multi-file program
- more organized code
Entry 10: 4/5/2012
In class we have been learning about multi-file programs, and in order to do that you need to create .o files. I learned you have to make a .h file w/ a corresponding .cc file, in order to get a .o file. then include that header file in your program using “” instead of <>
- .o files
- need them for making multi-file programs
Entry 11: 4/24/12
Today in C/C++ class we learned a little more about classes. We talked about the “friends” class. I learned that kids cannot access their parents private parts, but friends can access their parents private parts.
- friends classes
- friends can have access to the private things in the parent class
Entry 12: 4/26/12
today in C/C++ class Matt reviewed a little bit about forms. Forms cannot be used for every thing, but if you are in a situation where a form could be used it will save a lot of time, and code.
- forms
- can save you a lot of time and hassle
cprog Keywords
(protected)
protected class
Definition
protected base class can be accessed by a friend or member of any class by using a pointer to reference it.
(Friend)
friends class
Definition
can declare an external function as friend class to get access to the private and protected parts of the class
(polymorphism)
polymorphism
Definition
polymorphism is making a variable, objects, or function have more than one form.
(File Access)
File Access
Definition
accessing a file out side of the program to use by, and either reading, writing, or appending that file. to read you put “r” to write you put “w”
(Command line arguments)
command line arguments
Definition
an argument sent to a program being called. usually you type in the command prompt the name of the program followed by you command line argument like a file.
Demonstration
Demonstration of the chosen keyword.
lab46:~$ ./test file.csv
(cin)
cin
Definition
in C++ found in the header file iostream, overloads the left bit-shifter operator. usually takes info from user through keyboard. syntax is »
Demonstration
Demonstration of the chosen 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 <iostream> int main() { cin>>x>>y: return(0); }
(cout)
cout
Definition
in C++ found in the header file iostream, overloads the right bit-shifter operator. standard out put is usually the screen. syntax is «
Demonstration
Demonstration of the chosen 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 <iostream> int main() { cout<<"this is going to the screen"<<"\n"; return(0); }
(cerr)
cerr
Definition
in C++ found in the header file iostream. The error output, normally the screen. syntax is «
Demonstration
Demonstration of the chosen 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 <iostream> int main() { cerr << "Error message : " << str << endl; return(0); }
cprog Objective
cprog Objective
-write and compile code that utilizes programming constructs -use pointers and variables to discover the indirect properties of data storage -comprehend the basics of memory management, data representation and storage -identify and label various data types as scalar vs. composite -distinguish and explain difference between homogeneous and heterogeneous composite data types -break down and separate code into functions and illustrate the use of parameter passing -justify the use of various programming constructs within code solutions -discover the standard libraries and use libraries in solving problems
Definition
students should be able to -Write programs -use pointers effectively -understand what memory management is. -use the different data types -use the different libraries to do what your trying to do
Method
I will be measuring my success in this class on whether or not i will be able to complete the projects.
Measurement
According to my method, i am understanding the basics of what i need to do, but when it comes to putting it all together in a programs by my self, i am only able to do about have of it. I end up needing to get assistance from Matt or class mates.
Analysis
Reflect upon your results of the measurement to ascertain your achievement of the particular course objective.
i am doing pretty good there is definitively room for improvement i think my method is a pretty good way to measure success
Experiments
Experiment 7
Question
What happens if i leave the semi colon off of the end of a printf statement
Resources
C pocket reference
Hypothesis
Based on what i have been reading in the C pocket reference, if i leave a needed semi colon off of a printf statement it will give me a syntax error and not compile.
Experiment
I am going to take the semi colon off of the Hello, world! program's printf.
Data
When i took the semi colon off of the Hello, World! program and tried to compile it, the following error occurred: hello.c: In function 'main': hello.c:4: error: expected ';' before 'return'
Analysis
Based on the data collected:
- Was your hypothesis correct? Yes my Hypothesis was correct
Conclusions
I can conclude that if you have even one syntax error it will not compile your code, but it is very helpful by telling you where it is ( even down to telling you what line in the code it is on)
Experiment 8
Question
What will a simple for loop do if i change i++ to i–?
Resources
C programming text book
Hypothesis
Based on what i have read in the C book i++ increments by 1 every time it loops, my hypothesis is that i– will decrement by 1 every time it loops.
Experiment
#include<stdio.h> int main() { int i; for (i = 0; i < 10; i--) { printf ("i=%d\n",i); } return 0; }
Data
When i ran this program with i– in the for loop, it did decrement by 1 but it continuously looped, and i had to exit the terminal.
Analysis
Based on the data collected:
- Was your hypothesis correct? Sort of, it did decrement.
- What shortcomings might there be in your experiment? yes, i did not change the counter sign in the for loop to account for decrementing.
Conclusions
I have concluded that you can increment and decrement in a for loop, just make sure you change the counter statement.
Retest 3
Perform the following steps:
State Experiment
Whose existing experiment are you going to retest? Provide the URL, note the author, and restate their question.
Resources
Evaluate their resources and commentary. Answer the following questions:
- Do you feel the given resources are adequate in providing sufficient background information?
- Are there additional resources you've found that you can add to the resources list?
- Does the original experimenter appear to have obtained a necessary fundamental understanding of the concepts leading up to their stated experiment?
- If you find a deviation in opinion, state why you think this might exist.
Hypothesis
State their experiment's hypothesis. Answer the following questions:
- Do you feel their hypothesis is adequate in capturing the essence of what they're trying to discover?
- What improvements could you make to their hypothesis, if any?
Experiment
Follow the steps given to recreate the original experiment. Answer the following questions:
- Are the instructions correct in successfully achieving the results?
- Is there room for improvement in the experiment instructions/description? What suggestions would you make?
- Would you make any alterations to the structure of the experiment to yield better results? What, and why?
Data
Publish the data you have gained from your performing of the experiment here.
Analysis
Answer the following:
- Does the data seem in-line with the published data from the original author?
- Can you explain any deviations?
- How about any sources of error?
- Is the stated hypothesis adequate?
Conclusions
Answer the following:
- What conclusions can you make based on performing the experiment?
- Do you feel the experiment was adequate in obtaining a further understanding of a concept?
- Does the original author appear to have gotten some value out of performing the experiment?
- Any suggestions or observations that could improve this particular process (in general, or specifically you, or specifically for the original author).
