c++第三次作业

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一、（本月有几天？）

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

二、(多分数段函数求值)

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

三、（定期存款利息计算器）

#include<iostream>   #include<cmath>  using namespace std;  int main( )  {     int money,a,b,c;   cout<<"欢迎使用利息计算器!"<<endl;   cout<<"请输入存款金额:"<<endl;   cin>>money;   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<<"请输入存款期限的代号:"<<endl;   cin>>a;   switch(a)   {   double b,c;   case 1:b=money*0.031*0.25; c=b+money;cout<<"到期利息为:"<<b<<","<<"本息合计共"<<c<<"元"<<endl;break;   case 2:b=money*0.033*0.5; c=b+money;cout<<"到期利息为:"<<b<<","<<"本息合计共"<<c<<"元"<<endl;break;   case 3:b=money*0.035*1; c=b+money;cout<<"到期利息为:"<<b<<","<<"本息合计共"<<c<<"元"<<endl;break;   case 4:b=money*0.044*2; c=b+money;cout<<"到期利息为:"<<b<<","<<"本息合计共"<<c<<"元"<<endl;break;   case 5:b=money*0.05*3; c=b+money;cout<<"到期利息为:"<<b<<","<<"本息合计共"<<c<<"元"<<endl;break;   case 6:b=money*0.055*5; c=b+money;cout<<"到期利息为:"<<b<<","<<"本息合计共"<<c<<"元"<<endl;break;   }   cout<<"感谢您的使用，欢迎下次光临!"<<endl;   return 0;}

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