Sum of float arguments

Write a program to add all the arguments of a function, pass all the floats as parameter.

#include<stdio.h>
#include<stdarg.h>
float Calculate_sum(int,...);
int main()
{
	float sum;
	sum = Calculate_sum(2,10.4,20.5);
	printf("Sum = %f\n",sum);
	sum = Calculate_sum(3,10.1,20.2,30.3);
	printf("Sum = %f\n",sum);
	sum = Calculate_sum(4,10.4,20,30,40);
	printf("Sum = %f\n",sum);
	sum = Calculate_sum(5,10.3,20,30,40.4,50);
	printf("Sum = %f\n",sum);
	return 0;
}
float Calculate_sum(int n, ...)
{
	va_list v;
	float sum = 0.0,num;
	int i;
	va_start(v,n);
	for(i = 0;i < n;i++)
	{
		num = va_arg(v,double);
		sum += num;
	}
	va_end(v);
	return sum;
}

Output

Sum = 30.900000
Sum = 60.599998
Sum = 40.699989
Sum = 50.700001