PAT 1027 Colors in Mars

#include<iostream>using namespace std;int main(){char a[13] = {'0','1','2','3','4','5','6','7','8','9','A','B','C'};int num;int tmp;for(int i=0; i<3; ++i){cin>>num;if(!i)cout<<"#";tmp = num / 13;cout<<a[tmp];tmp = num % 13;cout<<a[tmp];}cout<<endl;return 0;}