简单四则运算

源代码来源：http://www.cnblogs.com/luffyyang/p/4317952.html（作者：No.1ASCE）

平台：windows

语言：c/c++

运行环境：vc6.0

修改、添加：无bug，添加了判断对错以及统计分数的功能，由于源代码的减法和除法操作未考虑除数不能为零、差不能为负数，所以做了小的改动。

Github地址：https://github.com/Fat-glouble/hello-world/blob/master/简单四则运算.txt

#include<iostream>
using namespace std;
void main()
{
int i,x,y,z;
for(i=1;i<=30;i++)
{
x=rand()%99;
y=rand()%99;
z=(x+y)%4;
if(z==0)
cout<<i<<":<<x<<"+"<<y<<"="<<endl;
if(z==1)
cout<<i<<":<<x<<"-"<<y<<"="<<endl;
if(z==2)
cout<<i<<":<<x<<"*"<<y<<"y"<<endl;
if(z==3)
cout<<i<<":<<x<<"/"<<y<<"y"<<endl;
}
}

　　

#include<iostream>
#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#include<conio.h>
using namespace std;
void main()
{
     int i,j,x,y,z,w,q,r;//q商，r余数，w交换
     int answer[100],grade;
     srand((unsigned)time(NULL));
     for(i=1;i<=30;i++)
	 {
        x=rand()%99;  //产生随机数x为第一位数
        y=rand()%99;  //产生随机数y为第二位数
        z=rand()%4; //z用来确定随机产生的运算符号
        if(z==0)//输出算术式
        cout<<i<<"："<<x<<"+"<<y<<"="<<endl;

        if(z==1)
		{  
		    if(x<y) { w=x;x=y;y=w;}
           cout<<i<<"："<<x<<"-"<<y<<"="<<endl;
		}
        if(z==2)
        cout<<i<<"："<<x<<"*"<<y<<"="<<endl;

        if(z==3)
		{
	       if(y==0) 	y=1;
           cout<<i<<"："<<x<<"/"<<y<<"="<<endl;
		}
        switch(z)
		{
            case 0:
				   answer[z]=x+y;
	               break;
            case 1:
			       answer[z]=x-y;
	               break;
           case 2:
			       answer[z]=x*y;
	               break;
           case 3:
			       printf("
 quotient= ");
                   scanf("%d",&q);
	               printf("
 remainder=");
	               scanf("%d",&r);
		           for(j=9;j>1;j++)
				   {
	                 if((x%j==0)&&(y%j==0))
					 { x=x/j;y=y/j;}
				   }
                  if( (q==x/y)&&(r==x%y))
				  {
			        grade+=1;
                    printf("You are right ! 
");
				  }
                  else
                 printf("You are wrong !
");
		         break;
 }
	 
    if(z<3)
	{
        scanf("%d",&q);
		if(q==answer[z])
		{
	        grade+=1;
		    printf("You are right !
");
		}
		else
			printf("You are wrong !
");
	}
}

}