c++-作业3

来源：互联网发布：头文字d实力排名知乎编辑：程序博客网时间：2024/04/29 18:38

#include<iostream>#include<cmath>using namespace std;int main(){int x,y;cout<<"输入一个数x=";cin>>x;    if(x<2)    y=x;if(2<=x<6)  y=x*x+1;    if( 6<=x<10)   y=sqrt(x+1);if( x>=10 )y=1/(x+1);cout<<"输出一个数y=";cout<<y<<endl;    return 0;}

#include<iostream>  using namespace std;  int main()  {  double principal;  int num;  double interest;    cout<<"欢迎使用利息计算器"<<endl;  cout<<"请输入存款金额 :";  cin>>principal;  cout<<"====存款期限===="<<endl;  cout<<"1.3个月"<<endl;  cout<<"2.6个月"<<endl;  cout<<"3.一年"<<endl;  cout<<"4.两年"<<endl;  cout<<"5.三年"<<endl;  cout<<"6.五年"<<endl;   cout<<"请输入存款期限前的代号:";  cin>>num;  switch(num)  {      case 1: interest = principal *0.25*0.031;break;  case 2: interest = principal *0.5*0.0330;break;  case 3: interest = principal *1.0*0.0350;break;  case 4: interest = principal *2.0*0.0440;break;  case 5: interest = principal *3.0*0.0500;break;  case 6: interest = principal *5.0*0.0550;break;  default:break;    }  cout<<"到期利息为："<<interest<<"本息总共合计为："<<interest+principal<<endl;  cout<<"感谢你的使用，欢迎下次光临"<<endl;      }

#include<iostream>  using namespace std;   int main()    {        int  year, month, days;        cout << "请输入年、月: ";      cin >> year >> month;      switch(month)      {      case 1:      case 3:      case 5:      case 7:      case 8:      case 10:      case 12:           days = 31;           break;      case 4:      case 6:      case 9:      case 11:          days = 30;          break;      case 2:          if(year%4==0 && year%100!=0 ||year%400==0)              days = 29;          else              days =28;      }      cout<<year<<"年"<<month<<"月共有"<<days<<"天。"<<endl;      return 0;    }

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