简单的四则运算

语言：C/C++

源代码地址：https://git.coding.net/ljcrush/sizeyunsuan.git

#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 ! ");
}
}
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;
}
}