Set or Clear a Specific Bit in a Register

Code

 #include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    if (reg < 0 || reg > 255 || pos < 0 || pos > 7 || (mode != 0 && mode != 1)) {
        return 1;
    }
    
    
    if (mode == 1) {
        reg |= (1 << pos); 
    } else {
        reg &= ~(1 << pos); 
    }

    return reg;

}

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