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
    switch(mode) {
        case 1: // Set bit
                reg |= (1 << pos);
                break;
            case 0: // Clear bit
                reg &= ~(1 << pos);
                break;
            default:
                // Invalid mode, do nothing
            break;
    }
    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;
}