C++作业3

一.本月有几天

#include <iostream>  
using namespace std;  
int main() 
{ 
    int year,month,day;  
    cout<<"请您分别输入年份和月份：";  
    cin>>year>>month;
		switch(month)
		{
          case 1:  
          case 3:  
          case 5:  
          case 7:  
          case 8:  
          case 10:  
          case 12:
		  cout<<"本月天数为31天";break;  
          case 4:  
          case 6:  
          case 9:  
          case 11:cout<<"本月天数为30天";break;  
          case 2:{
			  if((year%4==0&&year%100!=0)||(year%400==0))
			      cout<<"本月天数为29天";
			  else
				  cout<<"本月天数为28天";
	         }   break;
		}
     return 0;
}

二.定期存款利息计算器

#include <iostream>

using namespace std;

int main()
{
    int money,number;
    double year,s,m,n;
    cout<<"欢迎使用利息计算器\n";
    cout<<"请输入存款金额:";
    cin>>money;
    cout<<"请输入存款期限代号:\n1.三个月\n2.六个月\n3.一年\n4.两年\n5.三年\n6.五年\n";
    cin>>number;
    switch(number)
    {
        case 1:year=0.25;s=0.031;break;
        case 2:year=0.5;s=0.033;break;
        case 3:year=1;s=0.035;break;
        case 4:year=2;s=0.044;break;
        case 5:year=3;s=0.05;break;
        case 6:year=5;s=0.055;break;
        default:cout<<"不好意思，您的输入有误!\n";
    }
    m=money*s*year;
    n=money+l;
    cout << "到期利息为" <<m<<"本息合计共"<<n<< endl;
    return 0;
}

三.多分数段函数的求值

#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<6)
		y=x*x+1;
	else if(x<10)
		y=sqrt(x+1);
	else if(x>=10)
		y=1/(x+1);
	cout<<"输出y的值为:"<<y;
	return 0;
}