1. Set or Clear a Specific Bit in a Register

#include <stdio.h>
#include <stdint.h>
unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    uint8_t value = reg;
    uint8_t output;
    if(mode == 1)
    {
        value |= (1 << pos);
    }
    else
    {
        value &= ~(1 << pos);
    }
    output = value;
    return output;
}

int main() {
    unsigned char reg;
    int pos, mode;
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}