View Code of Problem 27

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

            return 1;
             
}

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