C++作业2

#include<iostream.h>
void main()
{
int x,y;
cout<<"请输入x的值：";
cin>>x;
if(x>=1)
y=x-1;
else
y=-x+1;
cout<<"y的值为："<<y<<endl;
}

#include<iostream.h>
#include<cmath>
void main()
{
double x1,x2,y1,y2,d,s;
cout<<"请输入x1，y1的值：";
cin>>x1>>y1;
cout<<"请输入x2，y2的值：";
cin>>x2>>y2;
s=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
d=sqrt(s);
cout<<"两坐标的距离是："<<d<<endl;

}

#include<iostream.h>
void main()
{
int a,b,c;
cout<<"幸福银行欢迎您！"<<endl;
cout<<"请输入密码:";
cin>>a;
c=199624;
if(a==c)
{
cout<<"请选择以下功能：1.查询 2.取款 3.存款 4.转账 0.退出"<<endl;
cin>>b;
if(b==1)
cout<<"谢谢,您选择了查询功能\n";
if(b==2)
cout<<"谢谢,您选择了取款功能\n";
if(b==3)
cout<<"谢谢,您选择了存款功能\n";
if(b==4)
cout<<"谢谢,您选择了转账功能\n";
if(b==0)
cout<<"谢谢,您选择了退出，欢迎下次光临\n";
}
else
cout<<"密码错误!"<<endl;
}