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#include <iostream>
using namespace std;
const unsigned MAX_SIZE = 32;
char getCharByNumber(unsigned number)
{
if (number <= 9)
return '0' + number;
if (10 <= number && number <= 35)
return 'A' + (number - 10);
else
return 'a' + (number - 36);
}
unsigned getNumberByChar(char ch)
{
if ('0' <= ch && ch <= '9')
return ch - '0';
if ('A' <= ch && ch <= 'Z')
return 10 + ch - 'A';
if ('a' <= ch && ch <= 'z')
return 32 + ch - 'a';
}
void swap(int& a, int& b)
{
int temp = a;
a = b;
b = temp;
}
void convertFromDecimal(unsigned number, char result[], unsigned k)
{
unsigned resultInd = 0;
while (number != 0)
{
int symbolIndex = number % k;
result[resultInd++] = getCharByNumber(symbolIndex);
number /= k;
}
for (unsigned i = 0; i < resultInd / 2; i++)
swap(result[i], result[resultInd - 1 - i]);
}
unsigned convertToDecimal(const char number[], unsigned size, unsigned k)
{
unsigned mult = 1;
unsigned result = 0;
for (int i = size - 1; i >= 0; i--)
{
result += getNumberByChar(number[i]) * mult;
mult *= k;
}
return result;
}
//fill with spaces from start
void init(char buff[], unsigned start)
{
for (unsigned i = start; i < MAX_SIZE; i++)
buff[i] = ' ';
}
void print(const char buff[])
{
for (unsigned i = 0; i < MAX_SIZE; i++)
cout << buff[i];
cout << endl;
}
int main()
{
{
unsigned n = 12345;
char buff[MAX_SIZE];
init(buff, 0);
convertFromDecimal(123456, buff, 16);
cout << n << " to hex: ";
print(buff);
}
{
unsigned n = 12345;
char buff[MAX_SIZE] = { 'A', '1', '2', 'B' };
init(buff, 5);
unsigned result = convertToDecimal(buff, 4, 16);
cout << buff << " to decimal: " << result << endl;
}
}
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