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
    unsigned char mask = (1 << pos);
    // to set
    if(1 == mode)
    {
        reg |= mask; // reg = reg | mask;
    }
    else // to clear
    {
        mask = ~mask;
        reg &= mask;
    }
    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;
}