c++作业2

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

#include<iostream>
#include<cmath>
using namespace std;
class point
{
public:
point(int x= 0,int y=0) :x(x),y(y){}
friend float dist(point &p1,point &p2);
private:
int x,y;
};

float dist(point &p1,point &p2)
{
double x = p1.x-p2.x;
double y = p1.y-p2.y;
return static_cast<float>(sqrt(x*x+y*y));
}
int main()
{
int a,b,c,d;
cin>>a>>b>>c>>d;
point myp1(a,b),myp2(c,d);
cout<<dist(myp1,myp2)<<endl;

return 0;

#include<iostream>
using namespace std;
void  menu1()  //菜单1
{
int key;
cout<<"                   welcome to Jinlei's bank                        "<<endl<<endl;
do{
cout<<"please input your password"<<endl;
cin>>key;
}while(key!=111111);
}

void menu2()  //菜单2
{
int i;
cout<<"please choose the number before the choice(0 ~ 4)"<<endl<<endl;
cout<<"     *   1.Inquire(查询)"<<endl;
cout<<"     *   2.Withdrawals(取款)"<<endl;
cout<<"     *   3.deposit(存款)"<<endl;
cout<<"     *   4.Transfers(转账)"<<endl;
cout<<"     *   0.exit"<<endl;

cin>>i;

switch(i)
{
case 1:cout<<"Thank you for using the search function";break;//查询
case 2:cout<<"Thank you for using teller function;break";//取款
case 3:cout<<"Thank you for using the deposit function";break;//存款
case 4:cout<<"Thank you for using transfer function";break;//转账
case 0:break;
default:printf("\n输入错误!!!\n\n请重新选择\n\n");
}

}

int main()
{
menu1();
menu2();
cout<<"Think you for your using"<<endl;
}