double return type in c
#include<stdio.h>
double cal_per(int, int, int);
int main()
{
int a = 55, b = 66, c = 77;
double res;
res = cal_per(a,b,c);
printf("%f\n",res);
return 0;
}
double cal_per(int a, int b, int c)
{
double res;
res = (a+b+c)/300.0;
res *= 100;
return res;
}