c++作业3

#include <iostream.h>
void main()
{
double z;
int x,y,a;
cout<<"请输入年份：";
cin>>x;
cout<<"请输入月份：";
cin>>y;
z=x%4;
if(z==0)
{
if(y==2) a=29;
if(y==1||y==3||y==5||y==7||y==8||y==10||y==12) a=31;
if(y==4||y==6||y==9||y==11) a=30;
}
else
{
if(y==2) a=28;
if(y==1||y==3||y==5||y==7||y==8||y==10||y==12) a=31;
if(y==4||y==6||y==9||y==11) a=30;
}
cout<<"本月"<<a<<"天"<<endl;
}

#include <iostream.h>
void main()
{
cout<<"欢饮使用利息计算器"<<endl;
double x,z,h;
int y;
cout<<"请输入存款金额:";
cin>>x;
cout<<"======存款期限======"<<endl;
cout<<"1.3个月\n2.6个月\n3.一年\n4.二年\n5.三年\n6.五年"<<endl;
cout<<"请输入存款期限的代号:";
cin>>y;
switch(y)
{

case 1:z=x*0.031*0.25;break;
case 2:z=x*0.033*0.5;break;
case 3:z=x*0.035*1;break;
case 4:z=x*0.044*2;break;
case 5:z=x*0.05*3;break;
case 6:z=x*0.055*5;break;
}
h=x+z;
cout<<"到期利息为："<<z<<"元,"<<"本息合计共"<<h<<"元."<<endl;
cout<<"感谢您的使用，欢饮下次光临！"<<endl;
}

<span style="font-size:24px;">#include <iostream.h>
#include<cmath>
void main()
{
double x,y;
cout<<"请输入x的值：";
cin>>x;
if(x<2) y=x;
if(2<=x&&x<6) y=x*x+1;
if(6<=x&&x<10) y=sqrt(x+1);
if(x>=10) y=1/(x+1);
cout<<"y的值为：y="<<y<<endl;
}
</span>