View Code of Problem 27

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

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