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Re:为什么是错的?In Reply To:为什么是错的? Posted by:sunnyw at 2011-07-20 09:37:39 > #include<stdio.h>
> #include<math.h>
> main()
> {
> int a,b,i,j,count,m,k=1000;
> while(scanf("%d%d",&a,&b)&&a!=-1&&b!=-1&&k)
> {
> count=0;
> for(i=a;i<=b;i++)
> {
> m=(int)sqrt(i);
> for(j=2;j<=m;j++)
> {
> if(i%j==0)
> {
> break;
> }
> }
> if(j>m)
> count++;
> }
> if(a==0) /*当a=0时,加了一次,当a=1时加了一次,所以减2*/
> printf("%d\n",count-2);
> else if(a==1) /*a=1时加了一次,所以减,1*/
> printf("%d\n",count-1);
> else
> printf("%d\n",count);
> k--;
> }
> }
a ,b可能为0的,需要考虑,输入-1 1你的就会结束··········
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