c++作业3

项目二、输入年月得出此月结果为几天

#include <stdio.h>
void main()
{
int year,month,day;
printf("请输入年");
scanf("%d",&year);
printf("请输入月");
scanf("%d",&month);
if (month==1||month==3||month==5||month==7||month==8||month==10||month==12)

day=31;
else
{
if(month==4||month==6||month==9||month==11)
{
day=30;
}

else
{
if(year%4==0)
day= 29;
else
day=28;
}
}

printf("%d年%d月有%d日\n",year,month,day);

}

运行结果

项目三、定期存款利息计算器
#include <iostream>
using namespace std;
int main()
{
double interst,Money;
cout<<"欢迎使用利息计算器"<<endl;
cout<<"请输入存款金额";
cin>>Money;
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;
cout<<"请输入存款期限的代号:";
int a;
cin>>a;
switch (a) {
case 1:interst=Money*0.031*0.25;break;
case 2:interst=Money*0.033*0.5;break;
case 3:interst=Money*0.035*1;break;
case 4:interst=Money*0.035*2;break;
case 5:interst=Money*0.050*3;break;
case 6:interst=Money*0.055*5;break;
}
Money=interst+Money;
cout<<"到期利息为:"<<interst<<"元，本息合计共"<<Money<<"元\n";
cout<<"感谢您的使用，欢迎下次光临!\n";
return 0;
}



项目四

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int x;
double y;
cout<<" 请输入x的值";
cin>>x;
if(x<2)y=x;
else if(x>=2&&x<6)y=x*x+1;
else if(x>=6&&x<10)y=sqrt(x+1);
else y=1.0/(x+1);
cout<<"y="<<y;
return 0;
}

运行结果