Set or Clear a Specific Bit in a Register

Code

#include <stdio.h>

#define SET_REG_BIT(reg, x) ((reg) |= (1 << x))
#define CLEAR_REG_BIT(reg, x) ((reg) &= ~(1 << x))

unsigned char modifyBit(unsigned char reg, int pos, int mode) {

    return ((mode) ? SET_REG_BIT(reg, pos) : CLEAR_REG_BIT(reg, pos));
}

int main() {
    unsigned char reg;
    int pos, mode;
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}

Solving Approach