C解决PTA1027 Colors in Mars

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.

15 43 71

Sample Output:

#123456

核心思路

翻译完题目之后，我立马想进制转换，也把题目定位到进制转换，结果发现，进制转换还有一个数组能解决的，我直接惊呆了，只要取出数据就行了，通过编程真的会加深的问题的理解。

首先除以13得出13^1，然后%得出$13^0$,其余按照原样输出就行了。

完整代码

#include<stdio.h>
char radix[13]={
        '0','1','2','3','4','5',
        '6','7','8','9','A','B','C'

};
int main()
{
    int r,g,b;
    scanf("%d%d%d",&r,&g,&b);
    printf("#");
    printf("%c%c",radix[r/13],radix[r%13]);
    printf("%c%c",radix[g/13],radix[g%13]);
    printf("%c%c",radix[b/13],radix[b%13]);
    return 0;

}

测试效果