c++作业2

项目二

#include <iostream>using namespace std;int main(){int x,y1,y2;cout<<"输入x,计算出函数y的值为"<<endl;cin>>x;y1=x-1;y2=-x-1;if(x>=1)cout<<y1<<endl;elsecout<<y2<<endl;    return 0;}

项目3    

#include <iostream>    #include <cmath>      using namespace std;    int main()    {        double x1,y1,x2,y2,d;        cout<<"输入两个点的坐标，求这两个点的距离"<<endl;        cin>>x1>>y1;        cin>>x2>>y2;        d=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);        cout<<sqrt(d)\n;        return o;}  

 

 

项目4

#include <iostream>using namespace std;int main(){int a,b,c,d,e,f,x;cout<<"袁氏牛逼银行交大分行欢迎您"<<endl;cout<<"请输入密码"<<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"<<endl;        cout<<"2.取款"<<endl;        cout<<"3.存款"<<endl;cout<<"4.转账"<<endl;cout<<"0.退出"<<endl;cin>>x;switch(x){    case 1:cout<<"你选择了1号查询功能\n";break;case 2:cout<<"你选择了2号取款功能\n";break;case 3:cout<<"你选择了3号存款功能\n";break;case 4:cout<<"你选择了4号转账功能\n";break;default :cout<<"error\n";break;}}else cout<<"密码错误\n";return 0;}