1. Title
Martians express colors in computers in a similar way to earthly people.
In other words, the color is represented by 6 digits. The first 2 digits represent red ®, the middle 2 digits represent green (G), and the last 2 digits represent blue (B).
The difference with us is that they use 13 bases (0∼9 and A∼C) to represent color values.
Now given three decimal numbers used to represent color values (the number range is between [0,168]), please output their Martian RGB color values.
The input format
contains three decimal integers, representing the R, G, and B color values in decimal.
The output format is
one line, output a "#" first, and then output a 6-digit number to represent the RGB color value of Mars.
If the value of a certain color is converted into a 13 hexadecimal system and it is less than 2 digits, add 0 to the front to make up 2 digits.
Sample Input:
15 43 71
Output Sample:
#123456
Sample explanation
given number three 15, 43, 71represents the hexadecimal 13 respectively 12, 34, 56.
So put them together and the answer is #123456.
2. Code
Understand the usage of a function: The
reverse function is used to reverse the order within the range of [first,last) (including the element pointed to by first, excluding the element pointed to by last)
such as:
string str="www.mathor.top";
reverse(str.begin(),str.end());//str结果为pot.rohtam.wwww
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
using namespace std;
string calc(int n) //进制转换
{
string str;
while(n)
{
if(n%13<=9)
str+=n%13 +'0';
else
str+=n%13- 10 +'A';
n/=13;
}
reverse(str.begin(),str.end()); //将字符串翻转
while(str.size()<2) str='0'+str; //不足二位，补零
return str;
}
int main()
{
int a[3];
cin>>a[1]>>a[2]>>a[3];
cout<<'#';
for(int i=1;i<=3;i++)
{
cout<<calc(a[i]);
}
cout<<endl;
return 0;
}