PAT 1027. Colors in Mars (20)

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

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

Output

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 the left.
Sample Input

15 43 71

Sample Output

#123456

/* 此题略水。。
*/
#include "iostream"
#include "algorithm"
#include "stack"
#include "cstring"
using namespace std;

int main() {
int  a, b, c;
int ans[6];
cin >> a >> b >> c;
if (a >= 13) {
ans[1] = a % 13;
a /= 13;
ans[0] = a % 13;
}
else {
ans[0] = 0;
ans[1] = a%13;
}
if (b >= 13) {
ans[3] = b % 13;
b /= 13;
ans[2] = b % 13;
}
else {
ans[2] = 0;
ans[3] = b % 13;
}
if (c >= 13) {
ans[5] = c % 13;
c /= 13;
ans[4] = c % 13;
}
else {
ans[4] = 0;
ans[5] = c % 13;
}
cout << "#";
for (int i = 0; i < 6; i++)
if (ans[i] >= 10) {
cout << (char)(ans[i] - 10 + 'A');
}
else
cout << ans[i];
cout << endl;
return 0;
}