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  1. #include <cmath>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. long int convert_base10(const std::string& num, int base)
  6. {
  7.     int dig;
  8.     long int result = 0;
  9.     const int len = num.size();
  10.     for (int i = 0; i < len; i++)
  11.     {
  12.         if ((num[len-i-1] >= 'A') && (num[len-i-1] <= 'F'))
  13.         {
  14.             dig = num[len-i-1] - 55; // Why the magic number?
  15.         }
  16.         else
  17.         {
  18.             dig = num[len-i-1] - 48;
  19.         }
  20.         result += dig * pow(base, i);
  21.     }
  22.     return result;
  23. }
  24.  
  25. void convert_basei(long int num, int base, std::string& result)
  26. {
  27.     char rem;
  28.     result = "";
  29.     while (num)
  30.     {
  31.         if ((num % base) >= 10)
  32.         {
  33.             rem = (num % base) + 55;
  34.         }
  35.         else
  36.         {
  37.             rem = (num % base) + 48;
  38.         }
  39.         result.insert(0, 1, rem);
  40.         num /= base;
  41.     }
  42. }
  43.  
  44. int main()
  45. {
  46.     std::string result, num;
  47.     int base1, base2;
  48.     while (std::cin >> num >> base1 >> base2)
  49.     {
  50.         long int temp = convert_base10(num, base1);
  51.         convert_basei(temp, base2, result);
  52.         std::cout << "The result is [" << result<< "]." << std::endl;
  53.     }
  54.     std::cout << "Failed to parse input." << std::endl;
  55. }
  56.  
Success #stdin #stdout 0s 2992KB
comments (?)
stdin
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1111000  2 10
1111000  2 16
2102101  3 10
2102101  3 15
  12312  4  2
     1A 15  2
1234567 10 16
   ABCD 16 15
stdout
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The result is [120].
The result is [78].
The result is [1765].
The result is [7CA].
The result is [110110110].
The result is [11001].
The result is [12D687].
The result is [D071].
Failed to parse input.
https://ideone.com/G9GZLT
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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