简单四则运算

思路：

第一个运算数（生成两个随机数，组成真分数或随机生成一个整数），用随机数k标记+，-，*，/，如法炮制，生成另一个运算数。

所用时间：3小时

截图：

代码：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
void main()
{
int i,k,a,b,c,d,e,f;
srand((unsigned) time(NULL)); 
for(i=1;i<31;i++)
{

  a = rand() % (100);
  b= a % 2;
  if (b == 0)
  {
   d = rand() % (100);
   e = rand() % (100);
   if (d < e)
     printf ( "(%d/%d)",d,e);
   if (d>e)
      printf ("(%d/%d)",e, d);
   if (d == e)
   {
    if (d == 0)  
     printf ( "(%d/%d)",d ,((rand() % 100) + 2) / 2);
    else 
     printf( "(%d/%d)",d / 2 ,e);
   }
  }
  else
  {
   f = rand() % (100);
    printf("%d",f) ;
  }
  
  k = rand()%4;
  if (k == 0)  printf ("+");
  else if (k == 1)printf ("-");
  else if (k == 2) printf ("*");
  else printf ("/");

   a = rand() % (100);
  b= a % 2;
  if (b == 0)
  {
   d = rand() % (100);
   e = rand() % (100);
   if (d < e)
     printf ( "(%d/%d)",d,e);
   if (d>e)
     printf ("(%d/%d)",e, d);
   if (d == e)
   {
    if (d == 0)  
     printf ( "(%d/%d)",d ,((rand() % 100) + 2) / 2);
    else 
         printf( "(%d/%d)",d / 2 ,e);
   }
  }
  else
  {
   f = rand() % (100);
    printf("%d",f) ;
  }
   printf("=
") ;
  
 }

}

 代码行数：70行