Structure of C Programming
1 :- Each program begins with preprocessor directives that serve to provide information about functions from standard libraries and definitions of necessary program constants.
2 :- Every C program consists of one or more functions. Function is a self contained block of program which performs some kind of task.
3 :- Every C program begins with main() function. Every function has a return value.
4 :- For Example, consider the following program which gives summation of x and y as z.
#include<stdio. /*Preprocessor Directive*/
int sum(int,int); /*Function prototype for sum()*/
int a,b,c; /*Global Variables*/
float d; /*Global Variable*/
int main() /*main() function with return type*/
int x, y; /*Local variables to main()*/
z=sum(x,y); /*Function call*/
int sum (int x1, int y1) /*Definition of function sum()*/
return(); /*return value of function sum*/
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