# 可供小学2、2年级使用的四则运算

#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
using namespace std;
int main()
{
int d1, d2, d3, d4, d5, d6, D, i;
int op;
cout << "请选择要做要做的题的类型\n" << endl;
cout << "做整数四则运算输入1 \n" << "做分数四则运算输入2\n" << endl;
cin >> D;
srand(time(NULL));
switch (D){
case 1:

{
for (i = 1; i< 30; i++)
{
op = rand() % 4;
switch (op)
{
case 0:
d1 = rand() % 100;
d2 = rand() % 100;
cout << d1 << "+ " << d2 << "=" << endl;
break;
case 1:
d1 = rand() % 100;
d2 = rand() % 100;
if (d1 > d2)
cout << d1 << "-" << d2 << "=" << endl;
else
cout << d2 << "-" << d1 << "=" << endl;
break;
case 2:
d1 = rand() % 100;
d2 = rand() % 100;
cout << d1 << "*" << d2 << "=" << endl;
break;
case 3:
d1 = rand() % 100;
d2 = rand() % 100;
cout << d1 << "/" << d2 << "=" << endl;
break;
default: cout << "error\n";
}
}
}
break;
case 2:
{
for (i = 1; i<30; i++)
{
op = rand() % 4;
switch (op)
{
case 0:
d1 = rand() % 100;
d2 = rand() % 100;
d3 = rand() % 100;
d4 = rand() % 100;
cout << "(" << d1 << "/" << d2 << ")" << "+" << "(" << d3 << "/" << d4 << ")=" << endl;
break;
case 1:
d1 = rand() % 100;
d2 = rand() % 100;
d3 = rand() % 100;
d4 = rand() % 100;
if ((d1*d4)>(d2*d3))
cout << "(" << d1 << "/" << d2 << ")" << "-" << "(" << d3 << "/" << d4 << ")=" << endl;
else
cout << "(" << d1 << "/" << d4 << ")" << "-" << "(" << d3 << "/" << d2 << ")=" << endl;
break;
case 2:
d1 = rand() % 100;
d2 = rand() % 100;
d3 = rand() % 100;
d4 = rand() % 100;
cout << "(" << d1 << "/" << d2 << ")" << "*" << "(" << d3 << "/" << d4 << ")=" << endl;
break;
case 3:
d1 = rand() % 100;
d2 = rand() % 100;
d3 = rand() % 100;
d4 = rand() % 100;
cout << "(" << d1 << "/" << d2 << ")" << "/" << "(" << d3 << "/" << d4 << ")=" << endl;
break;
default: cout << "error\n";
}
}
}
break;
}
system("pause");
}

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