#include "stdafx.h"
#include"iostream"
using namespace std;
main()
{int n ;
printf("请输入数值月份：");
scanf("%d",&n);
    switch(n)
{case1:
cout<<"january";
break;
case2:
cout<<"febuary";
break;
    default:
        cout<<"对不起,不正确！\n";

}
}

case1,case2，case与1,2之间要有空格case 1
#include "stdafx.h"不用，删了就可以运行了