c++作业2

<span style="font-size:18px;">（1）分段函数求值</span>

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

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double x1,y1,x2,y2,d;
cout<<"请输入x1,y1,x2,y2的值";
cin>>x1>>y1>>x2>>y2;
d=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
cout<<"两点之间的距离是"<<d;
return 0;
}

#include<iostream>
using namespace std;
int main()
{
cout<<"中国建设银行欢迎您"<<endl;
cout<<"请输入密码"<<endl;
int p,x;
cin>>p;
if(p==123456)
{
cout<<"1.查询"<<"2.取款"<<"3.存款"<<"4.转账"<<"0.退出"<<endl;
cin>>x;
cout<<"谢谢，您选择了"<<x<<"号功能"<<endl;
}
else
cout<<"您的密码错误，请重新输入密码"<<endl;
return 0;
}