随机生成计算题

随机生成计算题，可以帮助需要提升计算能力的朋友。代码里有便民文字，我就不多介绍了。

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long n,a,x,z,s,s1,l,y,a1,m123,yushu;
    double t=0;
	srand(time(0));
	cout<<"你总共要做几题。如5 就是做5题"<<endl; 
	cin>>n;
	cout<<"你的题在什么范围内。如1 100，就是1到100之间"<<endl;
	cin>>s>>s1;
	cout<<"你要做什么题，1是加，2是没有负数的减法，3是乘，4是有负数的减法，5是没有余数的除法，6是有余数的除法"<<endl;
	cin>>l;
	if(l==1)
	{
	    for(int i=1;i<=n;i++)
	    {
	        x=rand()%s1+s;
		    y=rand()%s1+s;
		    cout<<x<<"+"<<y<<"=";
		    cin>>a;
		    if(a==x+y)
		    { 
		        cout<<"正确"<<endl;
		        cout<<endl;
			    cout<<endl; 
			    t++;
		    } 
		    if(a!=x+y) 
		    {
		        cout<<"错误"<<endl;
		        cout<<"正确答案是："<<x+y<<endl;
		        cout<<endl;
		        cout<<endl;
		    } 
	    } 
	}
	if(l==2)
	{
	    for(int i=1;i<=n;i++)
	    {
	        x=rand()%s1+s;
		    y=rand()%s1+s;
		    if(x>=y)
		        cout<<x<<"-"<<y<<"=";
		    else
		    {
		        m123=x;
		        x=y;
		        y=m123;
		        cout<<x<<"-"<<y<<"=";
			}
		    cin>>a;
		    if(a==x-y)
		    { 
		        cout<<"正确"<<endl;
		        cout<<endl;
			    cout<<endl; 
			    t++;
		    } 
		    if(a!=x-y) 
		    {
		        cout<<"错误"<<endl;
		        cout<<"正确答案是："<<x-y<<endl;
		        cout<<endl;
		        cout<<endl;
		    } 
	    } 
	}
	if(l==3)
	{
	    for(int i=1;i<=n;i++)
	    {
	        x=rand()%s1+s;
		    y=rand()%s1+s;
		    cout<<x<<"*"<<y<<"=";
		    cin>>a;
		    if(a==x*y)
		    { 
		        cout<<"正确"<<endl;
		        cout<<endl;
			    cout<<endl; 
			    t++;
		    } 
		    if(a!=x*y) 
		    {
		        cout<<"错误"<<endl;
		        cout<<"正确答案是："<<x*y<<endl;
		        cout<<endl;
		        cout<<endl;
		    } 
	    } 
	}
	if(l==4)
	{
	    for(int i=1;i<=n;i++)
	    {
	        x=rand()%s1+s;
		    y=rand()%s1+s;
		    cout<<x<<"-"<<y<<"=";
		    cin>>a;
		    if(a==x-y)
		    { 
		        cout<<"正确"<<endl;
		        cout<<endl;
			    cout<<endl; 
			    t++;
		    } 
		    if(a!=x-y) 
		    {
		        cout<<"错误"<<endl;
		        cout<<"正确答案是："<<x-y<<endl;
		        cout<<endl;
		        cout<<endl;
		    } 
	    }
    }
    if(l==5)
	{
	    for(int i=1;i<=n;i++)
	    {
	        x=rand()%s1+s;
		    y=rand()%s1+s;
		    while(x<y||x%y!=0) 
		    {
		    	x=rand()%s1+s;
		    	y=rand()%s1+s;
			}	
		    cout<<x<<"/"<<y<<"="<<"       注：/是指除号"<<"\n";
		    cin>>a;
		    if(a==x/y)
		    { 
		        cout<<"正确"<<endl;
		        cout<<endl;
			    cout<<endl; 
			    t++;
		    } 
		    if(a!=x/y) 
		    {
		        cout<<"错误"<<endl;
		        cout<<"正确答案是："<<x/y<<endl;
		        cout<<endl;
		        cout<<endl;
		    } 
	    }
    }
    if(l==6)
	{
	    for(int i=1;i<=n;i++)
	    {
	        x=rand()%s1+s;
		    y=rand()%s1+s;
		    while(x<y) 
		    {
		    	x=rand()%s1+s;
		    	y=rand()%s1+s;
			}	
		    cout<<x<<"/"<<y<<"="<<"   余数=       注：/是指除号"<<"\n";
		    cin>>a;
		    cin>>yushu;
		    if(a==x/y&&yushu==x%y)
		    { 
		        cout<<"正确"<<endl;
		        cout<<endl;
			    cout<<endl; 
			    t++;
		    } 
		    if(a!=x/y||yushu!=x%y) 
		    {
		        cout<<"错误"<<endl;
		        cout<<"正确答案是：商："<<x/y<<"余："<<x%y<<endl;
		        cout<<endl;
		        cout<<endl;
		    } 
	    }
    }
	a1=n;
	cout<<"你对了"<<t<<"题"<<endl; 
	cout<<"你的正确率是"<<t/n*100<<"%"<<endl;
    return 0;
}