C++第三次作业

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项目二，《几年几月有多少天》

一问题及代码

#include<iostream>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;elsedays=28;}cout<<year<<"年"<<month<<"月共有"<<days<<"天"<<endl;return 0;}

项目三，

一。问题及代码《分段函数》

#include<iostream.h>#include<math.h>int main(){    double x,y,i;    for(i=0;i<4;i++)    {    cout<<"请输入x的值"<<endl;    cin>>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"<<y<<endl<<endl;    }    return 0;}

一问题及代码《存款》

#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。"<<endl;    }    else        cout << "选择存款类型错误！"<<endl;    cout << "感谢您的使用，欢迎下次光临！"<<endl;    return 0;}

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