C++第3次作业

#include<iostream>
using namespace std;
int main()
{
int  type;
double m, t, rate, lixi;
cout << "欢迎使用利息计算器！";
cout << "请输入存款金额：";
cin >> m;
cout << "======存款期限======";
cout << "1. 五年";
cout << "2. 三年";
cout << "3. 二年 ";
cout << "4. 一年";
cout << "5. 六个月";
cout << "6. 三个月";
cout << "请输入存款期限的代号：";
cin >> type;
if (type>=1 && type <=6)
{
switch(type)
{
case 1:
t = 5;
rate = 0.055;
break;
case 2:
t = 3;
rate = 0.05;
break;
case 3:
t = 2;
rate = 0.044;
break;
case 4:
t = 1;
rate = 0.035;
break;
case 5:
t = 0.5;
rate = 0.033;
break;
case 6:
t = 0.25;
rate = 0.031;
break;
}
lixi = m * t * rate;
cout << "到期利息为：" << lixi << "元，本息合计共"<< lixi + m<<"元。"<<endl;
}
else
cout << "选择存款类型错误！"<<endl;
cout << "感谢您的使用，欢迎下次光临！"<<endl;
return 0;
}

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

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