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The C program begins with preprocessor directives that serves to provide information about functions from standard libraries and definitions of program constants.

The directives are #include and #define.

The C program consists of one or many functions, The functions are self contained block of program (set of instructions).

The C program begins with main() function, every function has a return value.

Example of C program:

#include <stdio.hm> 	/* preproccessor directive */
 extern int a,b;
 extern int c;
 int main()
 {
	int a,b;
	a=7;
	b=8;
	c=a+b;
	printf("Sum = %d \n",c);	
	return 0;
 }
			

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