C++作业3

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项目2：本月有几天？

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

项目3：定期存款利息计算器

#include<iostream.h>void main(){double a,c,d,e,f,g,h,k,w,p,q,r,s;cout<<"欢迎使用利息计算器！"<<endl;cout<<"请输入存款金额：";cin>>a;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;int b;cout<<"请输入存款期限的代号：";cin>>b;c=a*0.031*0.25;k=a+c;d=a*0.033*0.5;w=a+d;e=a*0.035*1;p=a+e;f=a*0.044*2;q=a+f;g=a*0.050*3;r=a+g;h=a*0.055*5;s=a+h;switch(b){case 1:cout<<"到期利息为："<<c<<"元，本息合计共"<<k<<"元。\n";break;case 2:cout<<"到期利息为："<<d<<"元，本息合计共"<<w<<"元。\n";break;case 3:cout<<"到期利息为："<<e<<"元，本息合计共"<<p<<"元。\n";break;case 4:cout<<"到期利息为："<<f<<"元，本息合计共"<<q<<"元。\n";break;case 5:cout<<"到期利息为："<<g<<"元，本息合计共"<<r<<"元。\n";break;case 6:cout<<"到期利息为："<<h<<"元，本息合计共"<<s<<"元。\n";break;default:cout<<"error\n";break;}cout<<"感谢您的使用，欢迎下次光临！"<<endl;}

项目4：多分数段函数求值

#include<iostream.h>#include<cmath>void main(){double x,y;cout<<"请输入x的值:";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的值是："<<y<<endl;}

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