C++作业3

#include <iostream>
using namespace std;
int main( )
{
double dSalary,dTax,dNetIncome; //收入总额 个人所得税 税后收入
cout<<"请输入您本月的收入总额（元）：";
cin>>dSalary;
// 下面求解应缴个人所得税dTax和税后收入dNetIncome
if(dSalary>=3500&&dSalary<=5000)
{
dTax=(dSalary-3500)*0.03;
dNetIncome=dSalary-dTax;
}
else if(dSalary<=8000)
{
dTax=(dSalary-3500)*0.1-105;
dNetIncome=dSalary-dTax;
}
else if(dSalary<=12500)
{
dTax=(dSalary-3500)*0.2-555;
dNetIncome=dSalary-dTax;
}
else if(dSalary<=38500)
{
dTax=(dSalary-3500)*0.25-1005;
dNetIncome=dSalary-dTax;
}
else if(dSalary<=58500)
{
dTax=(dSalary-3500)*0.30-2755;
dNetIncome=dSalary-dTax;
}
else if(dSalary<=83500)
{
dTax=(dSalary-3500)*0.35-5505;
dNetIncome=dSalary-dTax;
}
else
dTax=(dSalary-3500)*0.45-13505;
dNetIncome=dSalary-dTax;
cout<<"您本月应缴个人所和税 "<<dTax<<" 元，税后收入是 "<<dNetIncome<<" 元。\n";
cout<<"依法纳税，共享繁荣。谢谢使用！\n";
return 0;
}

#include <iostream>
using namespace std;
int main( )
{
int year, month,day;
cout<<"请输入年份和月份：";
cin>>year>>month;

switch(month)
{
case 1:day=31;break;
case 2:if( (year%4==0)&&(year%100!=0)||(year%400==0))
{
day=29;
}
else

day=28;break;

case 3:day=31;break;
case 4:day=30;break;
case 5:day=31;break;
case 6:day=30;break;
case 7:day=31;break;
case 8:day=31;break;
case 9:day=30;break;
case 10:day=31;break;
case 11:day=30;break;
case 12:day=31;

}
if(month>12)
cout<<"没有这个月"<<endl;
else
cout<<"本月有"<<day<<"天"<<endl;
return 0;
}

#include<iostream>
using namespace std;
int main()
{

double money,interest,mai;
int select;
cout<<"欢迎使用利息计算器！"<<endl;

cout<<"请输入存款金额：";
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. 二年"<<endl;
cout<<"5. 三年"<<endl;
cout<<"6. 五年"<<endl;
cout<<"请输入存款期限的代号：";
cin>>select;
switch(select)
{

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;

}
mai=money+interest;
cout<<"到期利息为"<<interest<<"元"<<endl;
cout<<"本息合计共"<<mai<<"元"<<endl;
cout<<"感谢您的使用，欢迎下次光临！";
return 0;

}