C++作业3

一、个人所得税计算器

#include <iostream>
using namespace std;
int main()
{
double dSalary,dTax=0,dNetIncome=0,s;
cout<<"请输入您本月的收入总额（元）：";
cin>>dSalary;
s=dSalary-3500;
if(0<=dSalary&&dSalary<1500)dTax=s*0.03,dNetIncome=dsalary-dtax;
else if(1500<=dSalary&&dSalary<4500)dTax=s*0.1-105,dNetIncome=dsalary-dtax;
else if(4500<=dSalary&&dSalary<9000)dTax=s*0.2-555,dNetIncome=dsalary-dtax;
else if(9000<=dSalary&&dSalary<35000)dTax=s*0.25-1005,dNetIncome=dsalary-dtax;
else if(35000<=dSalary&&dSalary<55000)dTax=s*0.3-2755,dNetIncome=dsalary-dtax;
else if(55000<=dSalary&&dSalary<80000)dTax=s*0.35-5505,dNetIncome=dsalary-dtax;
else dTax=s*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 y,m,d,s;
cout<<"请输入年月"<<endl;
cin>>y>>m;
if(m==1||m==3||m==5||m==7||m==8||m==10||m==12)
d=31;
else if(m==4||m==6||m==9||m==11)
d=30;
else if(y%4==0&&y%100!=0||y%400==0&&m==2)
d=29;
else d=28;
cout<<"这个月有："<<d<<"天"<<endl;
}

#include<iostream>
using namespace std;
int main()
{
int item;
double y,r,m,d;
cout<<"欢迎使用利息计算器"<<endl;
cout<<"请输入要存款的金额(元):";
cin>>d;
cout<<"=====存款期限====="<<endl;
cout<<"1.3个月\n"<<"2.6个月\n"<<"3.一年"<<endl;
cout<<"4.两年\n"<<"5.三年\n"<<"6.五年"<<endl;
cin>>item;
switch(item)
{
case 1:r=0.031,y=0.25; break;
case 2:r=0.033,y=0.5 ; break;
case 3:r=0.035,y=1   ; break;
case 4:r=0.044,y=2   ; break;
case 5:r=0.050,y=3   ; break;
case 6:r=0.055,y=5   ; break;
}
m=y*d*r;
cout<<"您的利息为(元):"<<m<<endl;
cout<<"您的本息为(元):"<<m+d<<endl;
}