For simplicity we divide our code into small pieces / modules known as functions. To use functions in C programming we need to define function prototype, function definition and finally we call the function to perform that functionality. Here we will define a simple sum function, which will accept 2 numbers as an input and will return sum of these numbers.
[js]
#include <stdio.h>
int sum(int x, int y); // this is prototype of our sum function.
int main(void){
// for simplicity we divide our code into small pieces / modules known as functions
// to use functions in C programming we need to define function prototype, function definition
// and finally we call the function to perform certain functionality
// here we will defin a simple sum function, which will accept 2 numbers as input and will return their sum
int number1, number2;
int a;
printf("Please Enter First Numbern");
scanf("%d", &number1);
printf("Please Enter Second Numbern");
scanf("%d", &number2);
// here we called our sum function with 2 input numbers entered by user
//Now this function will return the sum of these numbers which is assigned to variable a
a = sum( number1 , number2);
printf("Sum = %d", a);
return 0;
}
// following is the definition of our sum function
int sum(int x, int y){
int s;
s = x + y;
return s;
}
[/js]
Output:
