#include<iostream> using namespace std; int main(){ /** int a; cin>>a; switch(a) { case 1: cout<<"糖醋排骨"; break; case 2: cout<<"鱼香肉丝"; break; case 3: cout<<"水煮鱼"; break; case 4: cout<<"宫保鸡丁"; break; case 5: cout<<"红烧肉"; break; case 6: cout<<"回锅肉"; break; default : cout<<"无此编号菜"; break; } **/ int n; cin>>n; switch(n){ case 1: case 3: case 5: case 7: case 8: case 10: case 12: cout<<31; break; case 2: cout<<29; break; case 4: case 6: case 9: case 11: cout<<30; break; default: cout<<"Invalid."; } return 0; }