C++作业3

一、个人所得税计算器

#include <iostream>  
using namespace std;  
int main()  
{  
    double dSalary,dTax,dNetIncome,dx;
	cout<<"请输入您本月的收入总额（元）：";
	cin>>dSalary;
	dx=dSalary-3500;
    if (dx>0&&dx<=1500)
		dTax=(dSalary-3500)*0.03;
	else if (dx>1500&&dx<=4500)
		dTax=(dSalary-3500)*0.1-105;	
	else if (dx>4500&&dx<=9000)
		dTax=(dSalary-3500)*0.2-555;
	else if (dx>9000&&dx<=35000)
		dTax=(dSalary-3500)*0.25-1005;
	else if (dx>35000&&dx<=55000)
		dTax=(dSalary-3500)*0.3-2705;
    else if (dx>55000&&dx<=80000)
		dTax=(dSalary-3500)*0.35-5505;
	else if (dx>80000)
		dTax=(dSalary-3500)*0.45-13505;
	dNetIncome=dSalary-dTax;
	cout<<"您本月应缴个人所得税"<<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;
}

二、定期存款利息计算器

#include <iostream>    
using namespace std;    
int main()    
{    
    int type;    
    double money,period,rate,interest;    
    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<<"请输入存款期限代号：";    
    cin>>type;  
	switch(type)
	{
         case 1:    
            period=0.25;    
            rate=0.031;    
            break;    
         case 2:    
            period=0.5;    
            rate=0.033;    
            break;    
         case 3:    
            period=1;    
            rate=0.035;    
            break;    
         case 4:    
            period=2;    
            rate=0.044;    
            break;    
         case 5:    
            period=3;    
            rate=0.05;    
            break;    
         case 6:    
            period=5;    
            rate=0.055;    
            break; 
	}

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

三、多分数段函数求值

#include <iostream> 
#include <cmath>   
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>=2&&x<6)
		y=x*x+1;
	else if(x>=6&&x<10)
		y=sqrt(x+1);
	else if(x>=10)
		y=1/(x+1);
	cout<<"此时y="<<y<<endl;
	return 0;
}