二柱子四则运算（带真分数可判断正误，在线自动答题）

程序源代码

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(void)
 {
  int i = 0;
  int e,f,g,h,x1,x2,y,z;//g为计算值
  srand((unsigned)time(NULL)); //本地时间为种子
  printf("请选择你需要的题目类型 整数运算请输入1  真分数运算请输入2 ");
  scanf("%d", &x1);
  printf("请输入出题数量 ");
  scanf("%d", &x2);
  switch (x1)
  {
  case 1:
   {
    while (i < x2)
    {
     int a = rand() % 100; //产生随机数
     int b = rand() % 100;
     int j;
     j = rand() % 4; //产生随机符号0到3分别代表四则运算
     printf("%d", a);
     switch (j)
     {
     case 0:
      printf("+");
      g=a+b;
      break;
     case 1:
      printf("-");
      g=a-b;
      break;
     case 2:
      printf("*");
      g=a*b;
      break;
     case 3:
      printf("/");
      g=a/b;
      break;
     }
     printf("%d", b);
     printf(" = ");
     scanf("%d",&z);
     if(g==z)
      printf("回答正确 ");
     else if(g!=z)
      printf("回答错误 ");
     i++;
    }
   }
  
  case 2:
  {
   while (i < x2)
   {
    int a = rand() % 100; //产生随机数
    int b = rand() % 100;
    int c = rand() % 100;
    int d = rand() % 100;
    int j = rand() % 4;   //产生随机符号0到3分别代表四则运算
    if (b != 0 && d != 0)
    {
     if (a > b)
     {
      e = a, a = b, b = e;
     }
     if (c > d)
     {
      f = c, c = d, d = f;
     }
     printf("%d/%d", a, b);
     switch (j)
     {
     case 0:
      printf("+");          
      break;
     case 1:
      printf("-");         
      break;
     case 2:
      printf("*");     
      break;
     case 3:
      printf("/");     
      break;
     }
     printf("%d/%d", c, d);
     printf("=");
     scanf("%d/%d",&y,&z);
     if(g==y/z)
      printf("回答正确 ");
      else if(g!=y/z)
      printf("回答错误 ");
     i++;
    }
   }
  }
  }
  getchar();
  getchar();
  return 0;
 }

整个程序还有一些不健全的地方，还需后期继续完善。