1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

int main() {
    unsigned char reg_value; 
    int bit_pos, mode;

    scanf("%hhu %d %d", &reg_value, &bit_pos, &mode);

    if (bit_pos < 0 || bit_pos > 7 || (mode != 0 && mode != 1)) {
        printf("Invalid input
");
        return 1;
    }

    if (mode == 1) {
        // Set the bit
        reg_value |= (1 << bit_pos);
    } else {
        // Clear the bit
        reg_value &= ~(1 << bit_pos);
    }

    printf("%u
", reg_value);

    return 0;
}