小学四则运算1.0

//信1301-1班 张鹏宇 四则运算
#include<iostream>
#include<stdio.h>
#include<time.h>
using namespace std;

void main(){
    int num1,num2,num3,num4;
    int a,b;
    int i;
    srand((unsigned)time(NULL));

    for(i=0;i<30;i++){   //30个
    b=rand()%2;      
    if(b==0){    //num1整数
        num1=rand()%101;
        b=rand()%2;
        if(b==0){   //num2整数
            num2=rand()%101;
            a=rand()%4;
            if(a==0)
                cout<<num1<<"+"<<num2<<"="<<endl;
            if(a==1)
                cout<<num1<<"-"<<num2<<"="<<endl; 
            if(a==2)
                cout<<num1<<"*"<<num2<<"="<<endl;
            if(a==3){
                if(num2==0){
                    for(;num2==0;)
                        num2=rand()%101;
                    cout<<num1<<"/"<<num2<<"="<<endl;
                }
                else
                    cout<<num1<<"/"<<num2<<"="<<endl;
            }
        }
        else{   //num2分数
            num2=rand()%101;
            num3=rand()%101;
            for(;num2>=num3;)
                num3=rand()%102;
            for(;num3==0;)
                num3=rand()%102;
            a=rand()%4;
            if(a==0)
                cout<<num1<<"+"<<num2<<"/"<<num3<<"="<<endl;
            if(a==1)
                cout<<num1<<"-"<<num2<<"/"<<num3<<"="<<endl;
            if(a==2)
                cout<<num1<<"*"<<num2<<"/"<<num3<<"="<<endl;
            if(a==3){
                if(num2==0){
                    for(;num2==0;)
                        num2=rand()%101;
                    cout<<num1<<"/"<<"("<<num2<<"/"<<num3<<")"<<"="<<endl;
                }
                else
                    cout<<num1<<"/"<<"("<<num2<<"/"<<num3<<")"<<"="<<endl;
            }
        }
    }
                    
            if(b==1){    //num1分数
                num1=rand()%101;                
                num2=rand()%101;
                for(;num2==0;)
                    num2=rand()%101;
                b=rand()%2;
                if(b==0){     //num2整数
                    num3=rand()%101;
                    a=rand()%4;
                    cout<<num1<<"/"<<num2<<"+"<<num3<<"="<<endl;
                    if(a==1)
                        cout<<num1<<"/"<<num2<<"-"<<num3<<"="<<endl;
                    if(a==2)
                        cout<<num1<<"/"<<num2<<"*"<<num3<<"="<<endl;
                    if(a==3){
                        if(num3==0){
                            for(;num3==0;)
                                num3=rand()%101;
                            cout<<num1<<"/"<<num2<<"+"<<num3<<"="<<endl;
                        }
                        else
                            cout<<num1<<"/"<<num2<<"+"<<num3<<"="<<endl;
                    }
                }
                else{     //num2分数
                    num3=rand()%101;
                    num4=rand()%101;
                    for(;num3>=num4;)
                        num4=rand()%102;
                    for(;num4==0;)
                        num4=rand()%102;
                    a=rand()%4;
                   if(a==0)
                       cout<<num1<<"/"<<num2<<"+"<<num3<<"/"<<num4<<"="<<endl;
                   if(a==1)
                       cout<<num1<<"/"<<num2<<"-"<<num3<<"/"<<num4<<"="<<endl;
                   if(a==2)
                       cout<<num1<<"/"<<num2<<"*"<<num3<<"/"<<num4<<"="<<endl;
                   if(a==3){
                       if(num3==0){
                           for(;num3==0;)
                               num3=rand()%101;
                       }
                       else
                           cout<<"("<<num1<<"/"<<num2<<")"<<"/"<<"("<<num3<<"/"<<num4<<")"<<"="<<endl;
                   }
                }
    }
    }
}