四则运算

代码来源：http://www.cnblogs.com/m108280546/p/5269702.html

新增功能：可以自行循环

语言：C语言

编译环境：VC++6.0

运行环境：Windows

BUG：暂未发现BUG

GitHub地址：https://github.com/5Mei/calculate/blob/master/main.cpp

#include<iostream.h>
	#include<stdio.h>
	#include<stdlib.h>
	#include<string.h>
	#include<time.h>
	char Operator()
	{
	char op;
	int i;
	i=rand()%4+1;
	switch(i)
	{
	case 1: return '+';
	case 2: return '-';
	case 3: return 'x';
	case 4: return '/';
	}
	}
	void integer()
	{
	int x,y;
	char op;
	x=rand()%100+1;
	y=rand()%100+1;
	op=Operator();
	if(op=='-')
	while(x<y)
	{
	x=rand()%100+1;
	y=rand()%100+1;
	}
	cout<<x<<op<<y<<"="<<endl;
	}
	void fraction()
	{
	int a,b,c,d;
	a=rand()%100+1;
	b=rand()%100+1;
	c=rand()%100+1;
	d=rand()%100+1;
	char op;
	while(a<=b||c<=d)
	{
	a=rand()%100+1;
	b=rand()%100+1;
	c=rand()%100+1;
	d=rand()%100+1;
	}
	op=Operator();
	if(op=='-')
	while((b*c-a*d)<0)
	{
	a=rand()%100+1;
	b=rand()%100+1;
	c=rand()%100+1;
	d=rand()%100+1;
	}
	cout<<b<<"/"<<a<<op<<d<<"/"<<c<<"="<<endl;
	}
	void main()
	{
	A:srand(time(0));
	int c,i,n,m;
	cout<< "请输入出题类型"<<endl;
	cout<< "1.整数四则运算"<<endl;
	cout<< "2.分数四则运算"<<endl;
	cin>>i;
	cout<< "请输入出题数目"<<endl;
	cin>>n;
	for(m=1;m<=n;m++)
	{
	if(i==1)
	integer();
	else
	fraction();
	}
	goto A;
	}