Write a program which reads 20 real numbers and shows their sum and their multiplication.

Difficulty level
This exercise is mostly suitable for students 
#include<stdio.h>
int main()
{
	int i;
	double x, sum, mult;

	sum = 0;
	mult = 1;
	for(i=1;i<=20;i++)
	{
	    printf("Enter number %2d : ",i);
	    scanf("%lf",&x);
	    sum+=x;
	    mult*=x;
	}
	printf("Sum = %.4lf\tMult = %.4lf\n",sum,mult);
 
	return 0;
}
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Program output 11