Question

How to count the trailing zeros in a binary number using C

Answer 1

#include <stdio.h>
 
#define INT_SIZE sizeof(int) * 8 

int count_trailing_zeros(int number) {
    int zeros = 0;
  
    for (int i = 0; i < INT_SIZE; i++) {
        if ((number >> i ) & 1) {
            break;
        }
        zeros++;
    } 
    
    return zeros;
}

  
int main() {
    int number = 80; // 1010000

    printf("%i", count_trailing_zeros(number));
}
  
  
  
  
/*
run:
  
4
  
*/

 

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