#include <stdio.h> int main()//也可以用数组来写,会更加的方便简洁 {int n; scanf("%d",&n); switch(n) { case 1:printf("January,31"); break; case 2:printf("February,28/29"); break; case 3:printf("March,31"); break; case 4:printf("April,30"); break; case 5:printf("May,31"); break; case 6:printf("June,30"); break; case 7:printf("July,31"); break; case 8:printf("August,31"); break; case 9:printf("September,30"); break; case 10:printf("October,31"); break; case 11:printf("November,30"); break; case 12:printf("December,31"); break; default :break; } return 0;}