C Functions

Functions are blocks of code that perform a number of pre-defined commands to accomplish something productive. You can either use the built-in library functions or you can create your own functions.

Example 1

#include <stdio.h>
 
int mult ( int x, int y );
 
int main()
{
  int x;
  int y;
 
  printf( "Please input two numbers to be multiplied: " );
  scanf( "%d", &x );
  scanf( "%d", &y );
  printf( "The product of your two numbers is %d\n", mult( x, y ) );
  getchar(); 
}
 
int mult (int x, int y)
{
  return x * y;
}