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
    if (reg <0 || reg >255 || pos<0 || pos>7 ||( mode != 0 && mode != 1)){
        return 1;
    }

    if (mode == 1) {
        reg = reg | (1<< pos);
        return reg;
    }
        
    else{
         reg = 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;
}