c++作业3

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一、定期存款利息计算器

#include <iostream>using namespace std;int main(){      int a,b;      double interest,rate,term,sum;      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\n";      cout<<"1.3个月\n"<<"2.6个月\n"<<"3.一年\n"<<"4.二年\n"<<"5.三年\n"<<"6.五年\n";      cout<<"请输入存款期限的代号：";      cin>>b;      switch(b)    {      case 1:term=0.25;rate=0.031;break;      case 2:term=0.50;rate=0.033;break;      case 3:term=1.00;rate=0.035;break;      case 4:term=2.00;rate=0.044;break;      case 5:term=3.00;rate=0.050;break;      case 6:term=5.00;rate=0.055;break;    }      interest=a*term*rate;      sum=a+interest;      cout<<"到期利息为:"<<interest<<"元,"<<"本息合计共："<<sum<<"元。\n";      cout<<"感谢您的使用，欢迎下次光临！\n";    return 0;}

二、本月有几天？

<pre class="cpp" name="code">#include<iostream>using namespace std;int main(){    int  year, month, day;    cout << "请输入年份:";    cin>>year;    cout<<"请输入月份";    cin>>month;    switch(month)    {    case 1:    case 3:    case 5:    case 7:    case 8:    case 10:    case 12:   day=31;break;    case 4:    case 6:    case 9:    case 11:   day=30;break;    case 2:    if(year%4==0 && year%100!=0 ||year%400==0) day=29;    else       day=28;    }    cout<<year<<"年"<<month<<"月"<<"有"<<day<<"天\n";    return 0;}

三、多分数段函数求值

<pre class="cpp" name="code">#include <iostream>#include<cmath>using namespace std;int main(){    double x,y;    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<<"分段函数y的值为:"<<y<<endl;    return 0;}

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