View Code of Problem 27

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