思路分析：
用一个字符串数组str存储0-9，A-C，str[i]对应i的字符串形式，将int型转换为char型
#include"stdafx.h"
#include<stdlib.h>
void func(int a) {char str[15] = "0123456789ABC", ans[5];int x, y;x = a / 13;y = a % 13;ans[0] = str[x];ans[1] = str[y];ans[2] = '\0';printf("%s", ans);
}
int main()
{int a;for (int i = 0; i < 3; i++) {scanf("%d", &a);if (i == 0) printf("#");func(a);}printf("\n");return 0;
}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”