Sum of two numbers with function

 #include<stdio.h>

// sum is a function which takes a and b as input and returns an integer as an output

int sum(int a, int b); // function prototype declaration

int main(){

    int c;

    c = sum(2, 15); // function call

    printf("The value of c is %d\n", c);

    return 0;

}

int sum (int a, int b){

    int c;

    c = a + b;

    return c;

}