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, x;
	long long sum;
	while (scanf("%d%d", &a, &b) != EOF)
	{
		sum = 0;
		x = a;
		if (a > b)
		{
			a = b;
			b = x;
		}
		for (i = a + 1; i < b; i++)
		{
			if (isprime(i))
			{
				sum = sum + i;
			}
		}
		printf("%lld\n", sum);
	}
	return 0;
}