作业

#include<iostream>
using namespace std;
int main()
{
int Year,Month,Day;
cout<<"请输入年份和月份病用空格隔开"<<"\n";
cin>>Year>>Month;
switch(Month)
{
case 2:
if(Year%100==0)
{
if(Year%400==0)  Day=29;
else  Day=28;
}
else
{
if(Year%4==0)  Day=29;
else  Day=28;
}
break;
case 1:Day=31;
case 3:Day=31;
case 5:Day=31;
case 7:Day=31;
case 8:Day=31;
case 10:Day=31;
case 12:Day=31;break;
case 4:Day=30;
case 6:Day=30;
case 9:Day=30;
case 11:Day=30;break;
default:cout<<"您输入的月份有误"<<"\n";
}
cout<<"该月份天数为"<<Day<<"\n";
return 0;
}

#include<iostream>
using namespace std;
int main()
{
int time;
float money,interest;
cout<<"欢迎使用利息计算器"<<"\n";
cout<<"请输入存款金额";  cin>>money;
cout<<"======存款期限======="<<"\n"
<<"1.三个月"<<"\n"
<<"2.六个月"<<"\n"
<<"3.一年"<<"\n"
<<"4.二年"<<"\n"
<<"5.三年"<<"\n"
<<"6.五年"<<"\n"
<<"请输入存款的期限代号";  cin>>time;
switch(time)
{
case 1:interest=money*0.031*0.25;break;
case 2:interest=money*0.033*0.5;break;
case 3:interest=money*0.035*1;break;
case 4:interest=money*0.044*2;break;
case 5:interest=money*0.05*3;break;
case 6:interest=money*0.055*5;break;
default:cout<<"您输入的存款期限代号有误"<<"\n";
}
cout<<"到期利息为"<<interest<<"元，本息合计共"<<interest+money<<"\n"
<<"感谢您的使用，欢迎下次光临";
return 0;
}

#include<iostream>
#include<math.h>
using namespace std;
int main()
{
double 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  y=1/(x+1);
}
}
cout<<"y的值为"<<y<<"\n";
return 0;
}