Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    if(mode == 0)
    {
        if((pos < 8) && (pos >= 0))
        {
            return reg &= ~(1 << pos); 
        }
        else
        {
            return 0;
        }
    }
    else if(mode == 1)
    {
        if((pos < 8) && (pos >= 0))
        {
            return reg |= (1 << pos);
        }
        else
        {
            return 0;
        }
    }
    else
    {
        return 0;
    }
    return 0;
}

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