1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

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

    // Input
    scanf("%u %d %d", &reg, &pos, &mode);

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

    // Output
    printf("%u", reg);

    return 0;
}