Hello World Example

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A C program basically consists of the following parts:

  • Preprocessor Commands
  • Functions
  • Variables
  • Statements & Expressions
  • Comments

Let us look at a simple code that would print the words “Hello World”:

#include <stdio.h>
int main()

{ /* my first program in C */
printf(“Hello, World! \n”);

return 0; }

Out Put

Hello, World!

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Let us take a look at the various parts of the above program:

1. The first line of the program #include is a preprocessor command, which tells a C compiler to include stdio.h file before going to actual compilation.

2. The next line int main() is the main function where the program execution begins.

3. PROGRAM STRUCTURE 15 3. 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.

4. The next line printf(…) is another function available in C which causes the message “Hello, World!” to be displayed on the screen.

5. The next line return 0; terminates the main() function and returns the value 0.

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