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;
}