c++作业2

1、两点间的距离

#include <iostream>  
#include<cmath>  
using namespace std;  
int main()  
{  
    double x1,x2,y1,y2,d;  
    cout<<"请依次输入(x1,y1),(x2,y2)坐标值："<<endl;  
    cout<<"(x1,y1)="<<"(x2,y2)="<<endl;  
    cin>>x1>>y1>>x2>>y2;  
    d=sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));  
	cout<<"两点间的距离为："<<"d="<<d<<endl;  
	return 0;  
}  

2、分段函数求值

#include <iostream>  
using namespace std;  
int main()  
{  
    int x;  
    cout<<"请输入x的值（整数）:"<<"x=";  
    cin>>x;  
    if(x>=1)  
        cout<<"y=x-1="<<x-1<<endl;  
    else  
        cout<<"y=-x+1="<<-x+1<<endl;  
    return 0;  
}  

3、模拟ATM

#include <iostream>  
using namespace std;  
int main()  
{  
    int a,b,c,d,e,f,g;  
    cout<<"欢迎来到徐氏银行"<<endl;  
    cout<<"请输入你的密码："<<endl;  
    cin>>a>>b>>c>>d>>e>>f;  
    if(a==1&&b==2&&c==3&&d==4&&e==5&&f==6)  
    {  
    cout<<"1、查询 2、取款 3、存款 4、转账 0、退出"<<endl;  
    cout<<"请输入你要办理的业务序号："<<endl;  
    cin>>g;  
    cout<<"谢谢，你选择了业务"<<g<<endl;  
    }  
    else  
        cout<<"密码错误"<<endl;  
    return 0;  
}