The document discusses a simple "Hello World" C program. It includes the source code, which prints "Hello World" using the printf function. It explains that a C program consists of preprocessor commands, comments, functions, variables, and statements/expressions. It then breaks down the parts of the "Hello World" program, noting that #include is a preprocessor command that includes the stdio.h header file, main is the starting function, /*...*/ are comments, printf is a function that displays the message, and return 0 terminates main and returns a value of 0.

1. Hello World
program
My first program in
C, Hello World !

2. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
A C program basically consists of
the following parts −
 Preprocessor Commands
 Comments
 Functions
 Variables
 Statements & Expressions

3. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
A C program basically consists of
the following parts −
 Preprocessor Commands

4. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
A C program basically consists of
the following parts −
 Functions

5. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
A C program basically consists of
the following parts −
 Comments

6. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
A C program basically consists of
the following parts −
 In built Functions

7. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
A C program basically consists of
the following parts −
 Part of Functions

8. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
The first line of the
program #include <stdio.h> is a
preprocessor command, which
tells a C compiler to include
stdio.h file before going to actual
compilation.

9. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
int main() is the main function
where the program execution
begins.

10. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
The next line /*...*/ will be
ignored by the compiler and it
has been put to add additional
comments in the program. So
such lines are called comments
in the program.

11. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
printf(...) is another function
available in C which causes the
message "Hello, World!" to be
displayed on the screen.

12. first program in C
#include <stdio.h>
int main() {
/* my first program in C */
printf("Hello, World! n");
return 0;
}
return 0; terminates the main()
function and returns the value 0.

13. practical
implementation