程序代码：

#include <stdio.h>
#include <stdlib.h>
void main()
{
   int x,y,i,j,k,sum,a=0,b=0;
   float c;
   printf("测试题数量:");
   scanf("%d",&j);
   for(i=1;i<=j;i++)
   {
   srand((unsigned)time(NULL));
   x=rand()%100;
   y=rand()%100;
   sum=x+y;
   printf("第%d题:",i);
   printf("%d+%d=",x,y);
   scanf("%d",&k);
   if(k==sum)
  {
       printf("正确!\n");
       a++;
  }
   
   else 
   {
    printf("错误!正确结果应该是%d\n",sum);
    b++;
   }
   }
   c=a/j;
   printf("回答正确%d道题,错误%d道题,正确率为%0.2f%%\n",a,b,c*100);
}