c++简单程序设计（1）

⑴实例2-4

#include
using namespace std;
int main()
{
    int day;
    cout<<"输入一个1到7的数字"<cin>>day;
    if(day<1||day>7)
    cout<<"输入错误"<else
    switch(day)
    {
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        cout<<"wokday.Let's work hard."<break;
        case 6:
        case 7:
        cout<<"weekend.Let's have a rest."<break;  


     } 
    return 0;
 } 

⑵实例2-6

#include
using namespace std;
int main()
{
    int n,x,y=0;
    cout<<"输入一个数："<cin>>n;
    cout<<"调换后结果是："<do
    {
        x=n%10;
        y=y*10+x;
        n/=10;
    }while(n!=0);
    cout<return 0;
}