简单四则运算

#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;

}

}

　　

<br>#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("\n quotient= ");

                   scanf("%d",&q);

                   printf("\n 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 ! \n");

                  }

                  else

                 printf("You are wrong !\n");

                 break;

 }

      

    if(z<3)

    {

        scanf("%d",&q);

        if(q==answer[z])

        {

            grade+=1;

            printf("You are right !\n");

        }

        else

            printf("You are wrong !\n");

    }

}

 

}