c++实验3作业

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项目二

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

项目三

#include<iostream>using namespace std;int main(){        int x;        double deposit,y1,y2,y3,y4,y5,y6;cout<<"欢迎使用利息计算器!"<<endl;cout<<"请输入存款金额："<<endl;cin>>deposit;cout<<"         存款期限          "<<endl;cout<<"1.三个月\n2.六个月\n3.一年\n4.二年\n5.三年\n6.五年\n"<<endl;cout<<"请输入存款期限的代号："<<endl;cin>>x;y1=deposit*0.031*0.25;y2=deposit*0.033*0.5;y3=deposit*0.035*1;y4=deposit*0.044*2;y5=deposit*0.050*3;y6=deposit*0.055*5;        switch(x){case 1:cout<<"到期利息为："<<y1<<"元，"<<"本息合计共："<<y1+deposit<<"元。";break;case 2:cout<<"到期利息为："<<y2<<"元，"<<"本息合计共："<<y2+deposit<<"元。";break;case 3:cout<<"到期利息为："<<y3<<"元，"<<"本息合计共："<<y3+deposit<<"元。";break;case 4:cout<<"到期利息为："<<y4<<"元，"<<"本息合计共："<<y4+deposit<<"元。";break;case 5:cout<<"到期利息为："<<y5<<"元，"<<"本息合计共："<<y5+deposit<<"元。";break;case 6:cout<<"到期利息为："<<y6<<"元，"<<"本息合计共："<<y6+deposit<<"元。";break;default:cout<<"输入错误。\n";break;}cout<<"感谢您的使用，欢迎下次光临！";        return 0;}

项目四

#include <iostream>#include <cmath>using namespace std;int main( ){    double x,y;    cout<<"输入x：";    cin>>x;    if(x>=10)        y=1/x+1;    else if(x>=6) y=sqrt(x+1);    else if(x>=2) y=x*x+1;    else y=x;    cout<<"y="<<y<<endl;    return 0;}

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