Question

How to check if a number has same number of set and unset bits in C

Answer 1

#include <stdio.h>
#include <stdbool.h>
  
void print_bits(unsigned int n) { 
    for (int i = 7; i >= 0; i--)
       printf("%d", (n >> i) & 1);
    printf("\n");
}
  
bool check_same_set_and_unset_bits(int n) { 
    int set = 0, unset = 0; 
    
    while (n) { 
        if (n & 1) 
            set++; 
        else
            unset++; 
        n = n >> 1; 
    } 
    
    if (set == unset) 
        return true; 
     
    return false; 
} 
    
int main() 
{ 
    int n = 178; 
    
    print_bits(n);
    
    if (check_same_set_and_unset_bits(n)) 
        printf("Yes\n"); 
    else
        printf("No\n"); 
        
    n = 179; 
    
    print_bits(n);
    
    if (check_same_set_and_unset_bits(n)) 
        printf("Yes\n"); 
    else
        printf("No\n"); 
      
    return 0; 
} 
  
  
  
/*
run:
  
10110010
Yes
10110011
No

*/

 

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