Question

How to toggle (invert) the Nth bit of a number in C

Answer 1

#include <stdio.h>
  
void print_bits(unsigned int n) { 
    for (int i = 31; i >= 0; i--)
       printf("%d", (n >> i) & 1);
    printf("\n");
}
  
int main()
{
    int num = 15, N = 2;
 
    print_bits(num);
    print_bits(1 << N);
     
    num = num ^ (1 << N);
    print_bits(num);
    printf("%d\n", num);
	
	N = 7;
	num = num ^ (1 << N);
	print_bits(num);
	
    return 0;
}
  
  
  
/*
run:
  
00000000000000000000000000001111
00000000000000000000000000000100
00000000000000000000000000001011
11
00000000000000000000000010001011
  
*/

 

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