Polynomial class c++

[bitbyte89]

im making a polynomial class, operator / is working while the operator /= overloaded function is not working.Someone pleasssssssssss ssseeeee help out. ive to submit it next week.

	int degree;
	double ab[100];
	char dummy;

/////////////////////////////Division////////

   Poly  Poly::operator/(Poly& a)
   {
	   Poly temp;
	   double result[20],temp1[20],temp2[20],temp3[20];
	   int count=0,cnt,i=0,j=0,k=0;

	   for(i=0 ; i<=20 ; i++)
	   {
		   result[i]=0;temp1[i]=0;temp2[i]=0;temp3[i]=0;

	   }

	   if(degree>=a.degree)
	   {
		   for(i=degree; i>=0 ; i--)
		   temp1[i]=ab[i]; 
		   for(i=a.degree-1 ; i>=0 ;i--)
		   temp2[i]=a.ab[i]*-1; 

		   
		   for(i=degree ; i>=a.degree ; i--)
		   {
			   cnt=0;
			  
			 result[count]=temp1[i];

			   for(j=a.degree-1 ; j>=0 ; j--)
			   {
				   temp3[j]=temp2[j]*temp1[i];
			   }

			   for(k=i-1 ; k>=0 ; k--)
			   {
				   if(a.degree-1-cnt>=0)
				   {
					   temp1[k]+=temp3[a.degree-1-cnt];
					   cnt++;
				   }
				   
			   }

			   count++;
			  
		   }
		     count-=1;

		   for(i=count ; i>=0 ; i--)
			   temp.ab[count-i]=result[i];
		   temp.degree=count;
		   temp.dummy=dummy;
	   }

	   else
		   cout<<" invalid input "<<"\n";

	   return temp;
   }


//////////not working

     Poly&  Poly::operator/=(Poly& a)
   {
	   double result[20],temp1[20],temp2[20],temp3[20];
	   int count=0,cnt,i=0,j=0,k=0;

	   for(i=0 ; i<=20 ; i++)
	   {
		   result[i]=0;temp1[i]=0;temp2[i]=0;temp3[i]=0;

	   }
	   

	   if(degree>=a.degree)
	   {
		    
		   for(i=degree; i>=0 ; i--)
		   temp1[i]=ab[i]; 
		   for(i=a.degree-1 ; i>=0 ;i--)
		   temp2[i]=a.ab[i]*-1; 

		   
		   for(i=degree ; i>=a.degree ; i--)
		   {
			   cnt=0;
			  
			 result[count]=temp1[i];

			   for(j=a.degree-1 ; j>=0 ; j--)
			   {
				   temp3[j]=temp2[j]*temp1[i];
			   }

			   for(k=i-1 ; k>=0 ; k--)
			   {
				   if(a.degree-1-cnt>=0)
				   {
					   temp1[k]+=temp3[a.degree-1-cnt];
					   cnt++;
				   }
				   
			   }

			   count++;
			  
		   } count--;

			  this->degree=count;

		   for(i=degree ; i>=0 ; i--)
		    this->ab[degree-i]=result[i];

		   cout<<"done";
		    
		  
	   }

	   else
		   cout<<" invalid input "<<"\n";

	   return *this;
  }

[weaknessforcats]

If your Poly::operator/() is working then why not just:

Poly& Poly::operator/=(Poly& a)
{
     *this = *this / a;
     return *this;
}

?

[bitbyte89]

If your Poly::operator/() is working then why not just:

Poly& Poly::operator/=(Poly& a)
{
     *this = *this / a;
     return *this;
}

?

u r genius.......oo oohhhh how stupid of me.....its working now....thanks a lot
a lot....im so happy......than ksss
but still why that function /= isn't working ??? i jst copy paste that / code and change the assignment of result to temporary object to this pointer...

[boxfish]

Perhaps in your /= operator you are using this as if it was the original polynomial after you have modified it.

[bitbyte89]

Perhaps in your /= operator you are using this as if it was the original polynomial after you have modified it.

but ive used this pointer when all the calculations are done....at the end before ending if ive changed the the original attributes it should work