c++第3次作业

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项目2：本月有几天？

#include<iostream>using namespace std;int main(){int dYear,dMonth,dDay;cout<<"请输入年份和月份：";cin>>dYear>>dMonth;if(dYear%4==0 && dYear%400==0){switch(dMonth){case 1: dDay=31;case 2: dDay=29; break;case 3: dDay=31; break;case 4: dDay=30; break;case 5: dDay=31; break;case 6: dDay=30; break;case 7: dDay=31; break;case 8: dDay=31; break;case 9: dDay=30; break;case 10: dDay=31; break;case 11: dDay=30; break;case 12: dDay=31; break;}  }  else  {  switch(dMonth)  {  case 1: dDay=31;  case 2: dDay=28; break;  case 3: dDay=31; break;  case 4: dDay=30; break;  case 5: dDay=31; break;  case 6: dDay=30; break;  case 7: dDay=31; break;  case 8: dDay=31; break;  case 9: dDay=30; break;  case 10: dDay=31; break;  case 11: dDay=30; break;  case 12: dDay=31; break;  }  }  cout<<"本月"<<dDay<<"天。"<<endl;  return 0;}

项目3：定期存款利息计算器

#include<iostream>using namespace std;int main(){double dRate,dTerm,dIncome,dInterest=0;//dRate为年利率，dTerm为存期，dInterest为利息int x,dMoney;cout<<"欢迎使用利息计算器！\n"<<"请输入存款金额：";cin>>dMoney;cout<<"======存款期限======\n"<<"1. 三个月\n"<<"2. 六个月\n"<<"3. 一年\n"<<"4. 两年\n"<<"5. 三年\n"<<"6. 五年\n";cout<<"请输入存款期限的代号："<<endl;cin>>x;switch(x){case 1:  dRate=0.031, dTerm=0.25;  break;case 2:  dRate=0.033, dTerm=0.5;  break;case 3:  dRate=0.035, dTerm=1;  break;case 4:  dRate=0.044, dTerm=2;  break;case 5:  dRate=0.050, dTerm=3;  break;case 6:  dRate=0.055, dTerm=5;  break;}dInterest=dMoney*dRate*dTerm;dIncome=dInterest+dMoney;cout<<"到期利息为："<<dInterest<<"元，"<<"本息合计共："<<dIncome<<"元。\n";cout<<"感谢你的使用，欢迎下次光临！"<<endl;return 0;}

项目4：多分数段函数求值

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

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