1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

#define REG_SET_BIT(reg, pos) ((reg) |= (1 << (pos)))
#define REG_CLEAR_BIT(reg, pos) ((reg) &= ~(1 << (pos)))

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here

    if (mode)
    {
        REG_SET_BIT(reg, pos);
    }
    else
    {
        REG_CLEAR_BIT(reg, 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;
}