View Code of Problem 27

#include <stdio.h>
#include <math.h>
int isSushu(int x)
{
	int state=1;
	int i;
	for(i=2;i<=sqrt(x);i++)
		if(x%i==0)
		{
			state=0;
			break;
		}
	if(state==1) return 1;
	else return 0;
}
int main()
{
	int a,b,i,sum=0;
	while(scanf("%d%d",&a,&b)!=EOF)
	{
		sum=0;
		for(i=a+1;i<b;i++)
		{
			if(isSushu(i))
			{
				sum=sum+i;
			}
		}
		printf("%d\n",sum);
	}
	return 0;
}