C++作业3

<pre class="cpp" name="code">1.定期存#include <iostream>
using namespace std;
int main()
{
	double money,interest,sum;
	int point,choose;
	cin>>money;
	cout<<"=====存款期限====="<<endl;
	cout<<"1.3个月\n2.6个月\n3.一年\n4.两年\n5.三年\n6.五年"<<endl;
	cout<<"请输入存款期限的代号"<<endl;
	cin>>choose;
		switch(choose)
	{
case1:
	interest=money*0.031*0.25;
	break;
case2:
	interest=money*0.033*0.25;
	break;
case3:
	interest=money*0.035*1;
	break;
case4:
	interest=money*0.044*2;
	break;
case5:
	interest=money*0.05*3;
	break;
case6:
	interest=money*0.05*5;
	}
	sum=money+interest;
	cout<<"到期利息为:"<<interest<<"元"<<endl;
	cout<<"本息共计为"<<sum<<"元"<<endl;
	cout<<"感谢您的使用，欢迎下次光临!"<<endl;
	return 0;
}款利息计算器

2.本月有几天#include <iostream>using namespace std;int main(){int year,month,day;cout<<"欢迎您使用龚氏日历！"<<endl;cout<<"请输入年份和月份"<<endl;cin>>year>>month;switch(month){case1:case3:case5:case7:case8:case10:case12:day=31;break;case4:case6:case9:case11:day=30;break;case2: if((year%4==0)&&(year%100!=0)||(year%400==0)) day=29; else day=28;break; if(month>12) cout<<"error"<<endl; }cout<<"该月有"<<day<<"天"<<endl;return 0;}

3.多分段函数求值

#include <iostream>
#include<cmath>
using namespace std;
int main()
{
	double x,y;
	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="<<y<<endl;
	return 0;
}