Toggle Bits

Exclusive-or toggles selected bits while leaving the others alone.

toggle_bits.c

#include <stdio.h>

int main(void) {
    int flags = ;
    int toggled = flags ^ 3;
    int restored = toggled ^ 3;

    printf("toggled=%d restored=%d\n", toggled, restored);
    return 0;
}

#include <stdio.h>

int main(void) {
    int flags = ;
    int toggled = flags ^ 3;
    int restored = toggled ^ 3;

    printf("toggled=%d restored=%d\n", toggled, restored);
    return 0;
}

#include <stdio.h>

int main(void) {
    int flags = ;
    int toggled = flags ^ 3;
    int restored = toggled ^ 3;

    printf("toggled=%d restored=%d\n", toggled, restored);
    return 0;
}

xor `^` flips a bit when the mask has `1` in that position.

repeated toggle Applying the same toggle twice returns the original bits.