PAT (Advanced Level) Practise：1027. Colors in Mars

【题目链接】

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

问题分析：

实际问题就是把10进制数转换为13进制数。

提交代码：

#include <stdio.h>

int decimal_to_other(int decimal, int base, char *other, int size)
{
    char str[256];
    int i, len, tmp;

    len = 0;

    //while(decimal != 0)
    do {
        tmp = decimal % base;
        if(tmp >= 10)
        {
            str[len] = tmp - 10 + 'A'; 
        }
        else
        {
            str[len] = tmp + '0';
        }
        len++;
        decimal /= base;
    } while(decimal != 0);

    for(i = 0; i < len && i < size-1; i++)
    {
        other[i] = str[len-1-i];
    }

    other[i] = '';

    return len;
}

int main(void)
{
    int R, G, B;
    int rl, gl, bl;
    char r[10];
    char g[10];
    char b[10];

    scanf("%d %d %d", &R, &G, &B);

    rl = decimal_to_other(R, 13, r, sizeof(r)/sizeof(r[0]));
    gl = decimal_to_other(G, 13, g, sizeof(g)/sizeof(g[0]));
    bl = decimal_to_other(B, 13, b, sizeof(b)/sizeof(b[0]));

    printf("#");

    if(rl == 1)
        printf("0");
    printf("%s", r);

    if(gl == 1)
        printf("0");
    printf("%s", g);

    if(bl == 1)
        printf("0");
    printf("%s", b);
 //printf("#%s%s%s", r, g, b);
    
    return 0;
}