1027 Colors in Mars (20 分)

People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, where the first 2 digits are for Red, the middle 2 digits for Green, and the last 2 digits for Blue. The only difference is that they use radix 13 (0-9 and A-C) instead of 16. Now given a color in three decimal numbers (each between 0 and 168), you are supposed to output their Mars RGB values.

Input Specification:

Each input file contains one test case which occupies a line containing the three decimal color values.

Output Specification:

For each test case you should output the Mars RGB value in the following format: first output #, then followed by a 6-digit number where all the English characters must be upper-cased. If a single color is only 1-digit long, you must print a 0 to its left.

Sample Input:

15 43 71

Sample Output:

#123456


转十三进制，话不多的说，水题

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     string s;
 5     s = '#';
 6     int n;
 7     for(int i = 0; i < 3; i++){
 8         cin >> n;
 9         string st="";
10         while(n){
11             int k = n%13;
12             if(k > 9){
13                 st += (k-10) + 'A';
14             }else{
15                 st += k + '0';
16             }
17             n /= 13;
18         }
19         if(st.length() == 1){
20             st += '0';
21         }else if(st == ""){
22             st = "00";
23         }
24         reverse(st.begin(),st.end());
25         s += st;
26     }
27     cout << s << endl;
28     return 0;
29 }