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
   // reg &=  ~(1 << pos);
    //reg |=  (mode << pos); 
    //reg &= (~(1<<pos) )| (mode << pos);
    reg ^= (-mode ^ reg) & (1 << pos);
    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;
}