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==1)
    {
        reg =reg|(1<<pos);

    }
    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;
}