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  1. #include <iostream>
  2.  
  3. unsigned count_digits(unsigned value, unsigned base = 10)
  4. {
  5.     unsigned n_digits = 0;
  6.     do
  7.     {
  8.         ++n_digits;
  9.         value /= base;
  10.     } while (value);
  11.  
  12.     return n_digits;
  13. }
  14.  
  15. void print_digit_count(unsigned value)
  16. {
  17.     std::cout << "In base 10, " << value << " has " << count_digits(value) << " digits.\n";
  18.     std::cout << "In base 2, " << value << " has " << count_digits(value, 2) << " digits.\n";
  19.     std::cout << "In base 16, " << value << " has " << count_digits(value, 16) << " digits.\n\n";
  20. }
  21.  
  22. int main()
  23. {
  24.     print_digit_count(56);
  25.     print_digit_count(0);
  26.     print_digit_count(1);
  27.     print_digit_count(128);
  28.     print_digit_count(0xFFFF);
  29. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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In base 10, 56 has 2 digits.
In base 2, 56 has 6 digits.
In base 16, 56 has 2 digits.

In base 10, 0 has 1 digits.
In base 2, 0 has 1 digits.
In base 16, 0 has 1 digits.

In base 10, 1 has 1 digits.
In base 2, 1 has 1 digits.
In base 16, 1 has 1 digits.

In base 10, 128 has 3 digits.
In base 2, 128 has 8 digits.
In base 16, 128 has 2 digits.

In base 10, 65535 has 5 digits.
In base 2, 65535 has 16 digits.
In base 16, 65535 has 4 digits.
https://ideone.com/Le5YZs
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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