四则运算

|博客班级 | https://edu.cnblogs.com/campus/ahgc/AHPU-SE-19/ |
|作业要求 | https://edu.cnblogs.com/campus/ahgc/AHPU-SE-19/homework/11376|
|作业目标 | 写一个能自动生成小学四则运算题目的程序 |
|学号 | 3170407334 |

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

int main()
{
 int i=0;
 int n=0;
 int x=0;
 int type;
 char flag;
 int left,right;
 float result;
 printf("请输入要出的题目数量\n");
 scanf("%d",&n);
 srand(unsigned(time(NULL)));
 while(x<n)
 {
  type = rand() % 4;
  left = rand() % 100;
  right = rand() % 100;
  switch(type)
  {
   case 0:
             printf("%d + %d = ?\n", left, right);
             break;
         case 1:
             printf("%d - %d = ?\n", left, right);
             break;
         case 2:
             printf("%d * %d = ?\n", left, right);
                 break;
         case 3:
             printf("%d / %d = ?\n", left, right);
             break;
         }
        
         i++;
         while(i>=n)
         {
          printf("一共 %d 题\n",i);
          printf("继续?[Y/N]\n");
          fflush(stdin);
          scanf("%c",&flag);
          if(flag=='Y'||flag=='y')
          {
           printf("请输入要出的题目数量\n");
           scanf("%d",&n);
            i=0;
            break;
           
    }
    printf("谢谢使用！\n");
     fflush(stdin);
     getchar();
     return 0;
   }
  }
 }}