最强大脑闪电心算草稿1

#include<bits/stdc++.h>
#include<windows.h>
using namespace std;
int main()
{
	double speed,n,op,sum=0;
	int ans;
	srand(time(NULL));
	cout<<"请输入加(1)/减(2)/加减混合(3):";
	cin>>op;
	cout<<"请输入题目数量:";
	cin>>n;
	cout<<"请输入速度间隔:";
	cin>>speed;
	int shui=speed*1000;
	system("cls");
	cout<<"闪电心算正式开始！";
	Sleep(5000); 
	system("cls");
	cout<<"3";
	Sleep(1000);
	system("cls");
	cout<<"2";
	Sleep(1000);
	system("cls");
	cout<<"1";
	Sleep(1000);
	system("cls");
	for(int i=1;i<=n;i++)
	{
		system("cls");
		int a=rand()%9+1,b=rand()%4+1;
		if(b==1) cout<<"-";
		else cout<<"+";
		cout<<a;
		if(b==1) sum-=a;
		else sum+=a;
		Sleep(shui);		
	}
	system("cls");
	cout<<"请输入你的最终答案：";
	cin>>ans;
	if(ans==sum) cout<<"正确"<<endl;
	else 
	{
		cout<<"错误"<<endl;
		cout<<"sum:"<<sum<<endl;
	}
	return 0;
}