Program to Turn off the rightmost set bit

C function that unsets the rightmost set bit of an integer.

Input: 10 (00…01010)
Output: 8 (00…01000)

Input: 7 (00…00111)
Output: 6 (00…00110)

Let the input number be n. n-1 would have all the bits flipped after the rightmost set bit (including the set bit). So, doing n&(n-1) would give us the required result.

Algorithm :

int fun(unsigned int n)
  return n&(n-1);

int main()
  int n = 7;
  printf("The number after unsetting the rightmost set bit %d", fun(n));

  return 0;

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C | C++ | Java |