1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    if(mode == 0){
        //Clear the Bit using & operation
        reg &= ~(1 << pos);  
    }
    else if(mode == 1){
        //Set the Bit using | operation 
        reg |= (1 << pos);
    }
    return reg;
}

int main() {
    unsigned char reg;   //8 bit integer -- register value 
    int pos, mode;  //Position of bit and operation 
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}