C/C++ Programming Journal

Day one.

Class Website http://www/haas/fall2013/cprog

lab46.corning-cc.edu/haas/fall2013/cprog

Class introduction to lab46 Regained some familiarity with the lab46 server, trying to remember useful Unix commands.

• SSH lab46 (to log in)
• screen -r (reconnects to the class IRC)
• Ctrl+d (disconnects from IRC)

C - LAB 1

Joe attempted to re-familiarize the class with Bitbucket.org repository. CSCS1320F13 If not already Joe should have a rule of 3's

Functions -

• Name
• Input
• Output

Variables -

• Name
• Value
• Data Type

Hierarchy of programming language

1. C - Higher level language
2. Translate / compile (GNU Linux - gcc)
3. Processor - Instruction set, machine code referred to as assembly

Preprocessing commands

#include <stdio.h> (has standard i/o functions like printf)

Hello World Program

Joe walked us through writing our first C program to gain some insight on how we use commands to get output from a program. So, opening vi editor and typing in the following commands gets us some output in the form of “Hello World”

Some of the basics of VIM I can remember:

• Cursor navigation - h ←, k ↑, l →, j ↓
• ESC for command mode
• Exit vim with out saving- :q!
• Save and exit - :wq or SHIFT+zz
• x - deletes selected character
• i - inserts , or a in command mode to append

Once our program was hastily written we needed to compile the program using GCC (GNU Compiler Collection). The command used was as follows. $gcc -Wall -o filename hello.c

GCC Manual - gcc.gnu.org Section 3 -

• pre-processing
• Compilation
• Assembly
• Link

Not lost yet…

Class Repo - src/cprog

• $mv *.c ~/src (move all files ending in .c to the src directory)
• $mkdir ~/src/cprog (make directory in src called cprog
• $mv *.c ~/src/cprog (moving all my .c files from src to new cprog dir)
• hg status
• hg add
• hg commit -m
• hg push
• hg update
• hg log

Data Types C uses keywords for data types, there are 3 types of data

Integer Types (scalar)

• char
• short int
• int
• long int
• long long int

Floating Point

• float
• double
• long double

Pointers(memory variables) (composite)

• Arrays
• Structures