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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int bitCount(unsigned int n) {
  5.  
  6.   int counter = 0;
  7.   while(n) {
  8.     counter ++;
  9.     n &= (n - 1);
  10.   }
  11.   return counter;
  12. }
  13.  
  14. int main() {
  15.     printf ("# 1-bits in base 2 representation of %u = %d, should be 1\n",
  16.         0b10000, bitCount (0b10000));
  17.     printf ("# 1-bits in base 2 representation of %u = %d, should be 0\n",
  18.         0, bitCount (0));
  19.     printf ("# 1-bits in base 2 representation of %u = %d, should be 1\n",
  20.         1, bitCount (1));
  21.     printf ("# 1-bits in base 2 representation of %u = %d, should be 16\n",
  22.         2863311530u, bitCount (2863311530u));
  23.     printf ("# 1-bits in base 2 representation of %u = %d, should be 1\n",
  24.         536870912, bitCount (536870912));
  25.     printf ("# 1-bits in base 2 representation of %u = %d, should be 32\n",
  26.         4294967295u, bitCount (4294967295u));
  27. 	return 0;
  28. }
Success #stdin #stdout 0.01s 5348KB
comments (?)
stdin 
Standard input is empty
stdout 
# 1-bits in base 2 representation of 16 = 1, should be 1
# 1-bits in base 2 representation of 0 = 0, should be 0
# 1-bits in base 2 representation of 1 = 1, should be 1
# 1-bits in base 2 representation of 2863311530 = 16, should be 16
# 1-bits in base 2 representation of 536870912 = 1, should be 1
# 1-bits in base 2 representation of 4294967295 = 32, should be 32
https://ideone.com/MEHIkC
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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