C++作业3

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#include<iostream>  using namespace std;  int main()  {      int year,month;      cout<<"请输入年份和月份:";     cin>>year>>month;  {          if(month==4||6||9||11)              cout<<"本月一共有30天";          else              cout<<"本月一共有31";}  if(month==2){            if((year%4==0)&&(year%100!=0)||(year%400==0))              cout<<"本月一共有29天";          else              cout<<"本月一共有28天";     }          return 0;  }

三，

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

四，<pre class="cpp" name="code">#include<iostream>  #include<cmath>  using namespace std;  int main()  {  int x,y;  cout<<"请输入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<<endl;    return 0;  }

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