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
    int bit_set=(reg & (1<<pos));  //returns 1 or o
    if(mode==1 && bit_set!=0)
    {
        //do nothing
    }
    else if(mode==1 && bit_set==0)
    {
        reg |= (1<<pos); 
    }
    else if(mode==0 && bit_set!=0)
    {
        reg &= ~(1<<pos); //clear
    }
    else{
       //do nothing
    }

    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;
}