1. Introduction to C Language

3. Steps in Learning C Language

5. Learn how to use commands/snippets of code/functions/libraries in an efficient and functional way

6. C History
C developed by Dennis Ritchie at AT&T Bell Labs in the 1970s.
Used to maintain UNIX systems
Many commercial applications written in C
Dennis M. Ritchie

7. C and C++
Both were “born” in the Computer Science Research Department of Bell Labs in Murray Hill, NJ

8. 2. A Simple C Program Comments #include <stdio.h>
1 /* Fig. 2.1: fig02_01.c
2 A first program in C */
3 #include <stdio.h> 4
5 int main()
6 {
7 printf( "Welcome to C!\n" ); 8
9 return 0;
10 }
Comments
Text surrounded by /* and */ is ignored by computer
Used to describe useful program information (description, author, date…)
#include <stdio.h>
Preprocessor directive
Tells computer to load contents of a certain library header file
<stdio.h> allows standard input/output operations

9. 2. A Simple C Program int main()
1 /* Fig. 2.1: fig02_01.c
2 A first program in C */
3 #include <stdio.h> 4
5 int main()
6 {
7 printf( "Welcome to C!\n" ); 8
9 return 0;
10 }
int main()
C programs contain one or more functions, exactly one of which must be main
Parenthesis used to indicate a function
int means that main "returns" an integer value
Braces ({ and }) indicate a block
The bodies of all functions must be contained in braces

10. 2. A Simple C Program printf( "Welcome to C!\n" );
1 /* Fig. 2.1: fig02_01.c
2 A first program in C */
3 #include <stdio.h> 4
5 int main()
6 {
7 printf( "Welcome to C!\n" ); 8
9 return 0;
10 }
printf( "Welcome to C!\n" );
Instructs computer to perform an action
Specifically, prints the string of characters within quotes (“ ”)
Entire line called a statement
All statements must end with a semicolon (;)
Escape character (\)
Indicates that printf should do something out of the ordinary
\n is the newline character

11. 2. A Simple C Program return 0; Right brace } A way to exit a function
1 /* Fig. 2.1: fig02_01.c
2 A first program in C */
3 #include <stdio.h> 4
5 int main()
6 {
7 printf( "Welcome to C!\n" ); 8
9 return 0;
10 }
Output:
Welcome to C!
return 0;
A way to exit a function
return 0, in this case, means that the main() function terminates normally and returns to the Windows operating system.
Right brace }
Indicates end of main has been reached

12. Preprocessor Directives

14. Integrated Development Environment (IDE)
It contains
Editor
Compilers
Debugger
Linkers
Loaders