C++第三次作业

项目二，《几年几月有多少天》

一问题及代码

#include
using namespace std;
int main()
{
	int year,month,days;
	cout<<"请输入年，月：";
	cin>>year>>month;
	switch(month)
	{
	case 1:
	case 3:
	case 5:
	case 7:
	case 8:
	case 10:
	case 12:
		days=31;
		break;
	case 4:
	case 6:
	case 9:
	case 11:
		days=30;
		break;
	case 2:
		if(year%4==0 && year%100!=0 ||year%400==0)
			days=29;
		else
			days=28;
	}
	cout<

项目三，

一 。问题及代码《分段函数》

#include
#include
int main()
{
    double x,y,i;
    for(i=0;i<4;i++)
    {
    cout<<"请输入x的值"<>x;
    if(x<2)
        y=x;
    else if(x<6)
        y=x*x+1;
    else if(x<10)
        y=sqrt(x+1);
    else
        y=1/(x+1);

    cout<<"y的值为"<

一 问题及代码《存款》

#include
using namespace std;
int main()
{
    int  type;
    double money, period, rate, interest;
    cout << "欢迎使用利息计算器！"<> 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 >> type;
    if (type>=1 && type <=6)
    {
        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，本息合计共"<< interest + money <<"元。"<