C++作业3——本月有几天、定期存款利息计算器、多分数段函数求值

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一、本月有几天

#include <iostream>  using namespace std;  int main() {     int year,month,day;      cout<<"请输入年份和月份：";      cin>>year>>month;switch(month){          case 1:            case 3:            case 5:            case 7:            case 8:            case 10:            case 12:  cout<<"该月天数为31天";break;            case 4:            case 6:            case 9:            case 11:cout<<"该月天数为30天";break;            case 2:{  if((year%4==0&&year%100!=0)||(year%400==0))      cout<<"该月天数为29天";  else  cout<<"该月天数为28天"; }break;}     return 0;}

运行结果

二、定期存款利息计算

#include<iostream>  using namespace std;  int main(){      int b;    double a,c,d,e,f;      cout<<"欢迎使用利息计算器！"<<endl;      cout<<"请输入存款金额:";      cin>>a;      cout<<"======存款期限======\n"<<"1.3个月\n"<<"2.6个月\n"<<"3.一年\n"<<"4.二年\n"<<"5.三年\n"<<"6.五年\n";    cout<<"请输入存款期限代号：";      cin>>b;    switch(b)    {    case 1:          c=0.0310,d=0.25;          break;      case 2:          c=0.0330,d=0.50;          break;      case 3:          c=0.0350,d=1.00;          break;      case 4:          c=0.0440,d=2.00;          break;      case 5:          c=0.0500,d=3.00;          break;      case 6:          c=0.0550,d=5.00;          break;      }      e=a*c*d;f=a+e;    cout<<"到期利息为："<<e<<"元，本息合计共"<<f<<"元";      return 0;}

运行结果

三、多分数段函数求值

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

运行结果

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