class member function problem

I am working on a class member function and am getting a couple of error messages that I don't understand.

I am getting the following error messages:
error 1 I think is because I'm performing a sqrt function which must be a double and putting it in an integer variable - converting to 'int' from 'double'

error2: non -1 value in assignment

The code below is supposed to run the blank function on vector p and find which location the blank spot is in. If the blank spot is in an "acceptable" position then the operation is performed. For example, if I had a vector of size 16 (user chooses side length and a vector of side length squared is created), I am filling the vector with the numbers from 1 through 15 and then leaving a "blank". for the example below, if the blank isn't located in the bottom row (vector is displayed as 4 rows and 4 columns) then the blank is swapped with the contents of the vector address directly above it.

Please help me.

Code:

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bool Puzzle::slide_up(const Puzzle& p) const {
  int location=blank(p);
  int d=Puzzle::p.size();
  int rows=sqrt(d);
 
  if(location<d-rows){
  int temp;
  temp=location;
  location=location+rows;
  location+rows=temp;
 return true;
  }
  else
  return false;
}

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I doubt your error message says "non -1 value in assignment". I might believe l-value, given that it is surely impossible to assign anything to "location+rows" as you try to do.

>>location+rows=temp;
Is illegal in C++.
The assignment must be on left and the value you assign on the right.

ok. thank you. i was able to fix that problem with the help i received.

But there must be another problem:

Code:

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int d=Puzzle::p.size();

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Do you mean a member function of a static variable in the class 'Puzzle', or a member function of the object 'p', i.e.,

Code:

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int d=p.size();

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Very probably you mean the second option since you pass 'p' as argument...