1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

int main() {
    unsigned char reg;
    int pos, mode;

    // Read inputs
    scanf("%hhu", &reg);
    scanf("%d", &pos);
    scanf("%d", &mode);

    if (mode == 1) {
        // Set the bit
        reg = reg | (1 << pos);
    } else if (mode == 0) {
        // Clear the bit
        reg = reg & ~(1 << pos);
    }

    // Print modified register value
    printf("%d\n", reg);

    return 0;
}