#include <iostream>

using namespace std;

int main(){

int M, D, S; //宣告三個變數(整數)

cin>>M>>D; //輸入題目要求

S = (M * 2 + D) % 3; //將運算結果存取在變數S

switch(S){

case 0:

cout<<"普通"<<endl;

break;

case 1:

cout<<"吉"<<endl;

break;

case 2:

cout<<"大吉"<<endl;

break;

}

return 0;

}

投機取巧方式:
利用case未用break指令會繼續往下執行
直接將大吉的吉字和吉一起運行

#include <iostream>

using namespace std;

 

int main(){

int m, d, s;

 

cin >> m >> d;

 

s = (m * 2 + d) % 3;

 

switch(s){

case 0:

cout << "普通";

break;

 

case 2:

cout << "大";

default:

cout << "吉";

break;

}

 

return 0;

}