1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) 
{
    if (pos < 0 || pos > 7) 
    {
        return reg; 
    }

    if (mode == 1) 
    {
        // Set bit at position 'pos'
        reg |= (1 << pos);
    } else 
    
    {
        // Clear bit at position 'pos'
        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;
}