C++第二次作业

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

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double x1,y1,x2,y2,l;
cout<<"请输入a点的坐标："<<endl;
cin>>x1>>y1;
cout<<"请输入b点的坐标："<<endl;
cin>>x2>>y2;
l=sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
cout<<"两点之间的距离l=:"<<l<<endl;
return 0;
}

#include<iostream>
using namespace std;
int main()
{
int mm;
cout<<"尊敬的客户您好，罗氏银行欢迎您"<<endl;
cout<<"请您输入密码";
cin>>mm;
if(mm=123456)
{
cout<<"您可使用的功能选项"<<endl;
cout<<"1.查询\n"<<"2.取款\n"<<"3.存款\n"<<"4.转账\n"<<"0.退出\n"<<endl;
char choice;
cin>>choice;
switch(choice)
{
case'1':cout<<"查询功能\n";break;
case'2':cout<<"取款功能\n";break;
case'3':cout<<"存款功能\n";break;
case'4':cout<<"转账功能\n";break;
case'0':cout<<"感谢您的使用，再见\n";break;
default:cout<<"对不起，此选项错误\n";
}
}
else
cout<<"您输入的密码不正确\n";
return 0;
}