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 (mode == 1) {
        reg = reg | (1 << pos); //clear register value
    } else if (mode == 0) { //set reg value
        reg = reg & ~(1 << pos); //cast reg to new value
    } 
    return reg;
}

int main() {
    unsigned char reg; //register value
    int pos, mode; //pos is bit position
    //more for if they want to clear or set the bit
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}