View Code of Problem 27

#include<stdio.h>
#include<math.h>
#include <string.h>
#define Max 1000
int isprime(int n)
{
	int i;
	for(i=2;i<=sqrt(n);i++)
	{
		if(n%i==0)
		  return 0;
	}
	return 1;
}
int main()
{
	int a,b,i,t;
	
	while(scanf("%d %d",&a,&b)!=EOF)
	{
		if(a>b){t=a;a=b;b=t;}
	    int sum=0;
		for(i=a+1;i<b;i++)
		{
			if(isprime(i))
			  sum+=i;
		}
		printf("%d\n",sum);
	}
	return 0;
}