Question

How to toggle a single bit in C

Answer 1

#include <stdio.h>
 
void print_bits(unsigned int num, unsigned int size) {
    for (int i = 1 << (size - 1); i > 0; i = i / 2) {
        (num & i) ? printf("1") : printf("0");
    }
}
 
unsigned int toggle_bit(unsigned int number, unsigned int bit_number) {
    return number ^ ((unsigned int )1 << bit_number);
}
 
int main() {
    unsigned int num = 157;
     
    print_bits(num, 8);
     
    num = toggle_bit(num, 1);
     
    printf("\n");
     
    print_bits(num, 8);
 
    return 0;
}
 
 
 
/*
run:
 
10011101
10011111
 
*/

 

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