int reverseCompare(void * a, void * b){
return normalCompare(a, b) * -1;
}
BNum BNum::operator -(const BNum &other)
{
BNum result(0);
BNum first=*this;
BNum second=other;
int state=normalCompare(first,second);
//now we want minus second from first
//maybe the nums are neg or positive
//4 state:
//1: first is neg & second are positve.
//add twe nums and the sign of result is neg
//2: first is positive & second are negetive:
//add twe num and the sign of resutl is positive
//3: first and second are positive:
//3-1:if first is bigger:
//first - seocnd & the sign of result is positive
//3-2:if second is bigger:
//second - first & the sign of result is negetive
//4: first and second are negetive:
//4-1:if first is bigger:
//first-second & the sign of result is negetive
//4-2:if second is bigger:
//second-first & the sign of result is positive
//if i said first- second it means normal minus with twe positive
//1:
if(first.sign==false && second.sign==true)
{
result=normalPlus(first,second);
result.sign=false;
}
//2:
else if(first.sign==true && second.sign==false)
{
result=normalPlus(first,second);
result.sign=true;
}
//3:
else if(first.sign==true && second.sign==true)
{
if(state==1 || state==0)//first is bigger or equal (equal contains just for true for result.sign)
{
result=normalMinus(first,second);
result.sign=true;
}
else//second is bigger
{
result=normalMinus(second,first);
result.sign=false;
}
}
//4:
else if(first.sign==true && second.sign==true)
{
if(state==1)//first is bigger
{
result=normalMinus(first,second);
result.sign=false;
}
else//second is bigger or equal
{
result=normalMinus(second,first);
result.sign=true;
}
}
return result;
}
