You give a variable a value by using the '=' operator.

So the steps you need to go through are:

• Identify which variables are being used before they have been given a value
• Decide which value it would be appropriate to give them (often zero or the empty string)
• Use the assignment operator to assign the relevant operator to the correct variable

I hope that makes sense. I don't think I can break it down any more without just writing the code for you - and I hope you wouldn't want that.