1027. Colors in Mars (20) PAT

题目：http://pat.zju.edu.cn/contests/pat-a-practise/1027

简单题，考察十进制数和n进制数的转换和输出格式的控制。

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

---

#include<iostream>
#include<string.h>
using namespace std;

char red[2];
char green[2];
char blue[2];

void change(int a,char color[2],int base)
{
	int i=0;
	do
	{
		if( (a%base)<10 )
			color[i++] = ((a%base) + '0');
		else
			color[i++] = (a%base) + 'A' - 10;
		a /= base;
	} while (a != 0);
}

int main()
{
	memset(red,'0',sizeof(red));
	memset(green,'0',sizeof(green));
	memset(blue,'0',sizeof(blue));
	int base = 13;
    int a,b,c;
	int n;
	cin>>a>>b>>c;
	change(a,red,base);
	change(b,green,base);
	change(c,blue,base);
	cout<<"#";
    cout<<red[1]<<red[0];
	cout<<green[1]<<green[0];
	cout<<blue[1]<<blue[0]<<endl;

	return 0;
}