1. 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 result = 0;

    if(mode == 1)
    {
        /* set 1 at the position */
        result = (reg | (1 << pos));
    }
    else if(mode == 0)
    {
        /* clear the bit at position */
        result = (reg & (~(1 << pos)));
    }
    else
    {
        printf("invalid input \r\n");
    }

    return result;

}

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