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：
1 #include <stdio.h> 2 3 int decimal_to_other(int decimal, int base, char *other, int size) 4 { 5 char str[256]; 6 int i, len, tmp; 7 8 len = 0; 9 10 //while(decimal != 0) 11 do { 12 tmp = decimal % base; 13 if(tmp >= 10) 14 { 15 str[len] = tmp - 10 + 'A'; 16 } 17 else 18 { 19 str[len] = tmp + '0'; 20 } 21 len++; 22 decimal /= base; 23 } while(decimal != 0); 24 25 for(i = 0; i < len && i < size-1; i++) 26 { 27 other[i] = str[len-1-i]; 28 } 29 30 other[i] = ' '; 31 32 return len; 33 } 34 35 int main(void) 36 { 37 int R, G, B; 38 int rl, gl, bl; 39 char r[10]; 40 char g[10]; 41 char b[10]; 42 43 scanf("%d %d %d", &R, &G, &B); 44 45 rl = decimal_to_other(R, 13, r, sizeof(r)/sizeof(r[0])); 46 gl = decimal_to_other(G, 13, g, sizeof(g)/sizeof(g[0])); 47 bl = decimal_to_other(B, 13, b, sizeof(b)/sizeof(b[0])); 48 49 printf("#"); 50 51 if(rl == 1) 52 printf("0"); 53 printf("%s", r); 54 55 if(gl == 1) 56 printf("0"); 57 printf("%s", g); 58 59 if(bl == 1) 60 printf("0"); 61 printf("%s", b); 62 //printf("#%s%s%s", r, g, b); 63 64 return 0; 65 }