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
    // check validity of the position
    if(pos > 7 | pos < 0){
        printf("Invalid pos/n");
        return 0;
    }
    // if mode is not set or clear
    if(mode > 1 | pos < 0){
        printf("Invalid mode/n");
        return 0;
    }
    unsigned char modified_bit;
    switch (mode){
    case 1:
        modified_bit = reg | (1 << pos);
        return modified_bit;
    case 0:
        modified_bit = reg & ~(1 << pos);
        return modified_bit;
    }
    
}

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