Replace Magic Number with Symbolic Constant

Any time that a number is hard coded into the text, it should be replaced by a constant value for that class.

Example

public int power10(int num) {
 int result = 1;
 for(int i = 0; i < 10; i++) {
  result *= num;
 }
 return result;
}

Refactors into:

private static final int powerNum = 10;
 ...
public int power10(int num) {
 int result = 1;
 for(int i = 0; i < powerNum; i++) {
  result *= num;
 }
 return result;
}

Arguably the 0 and 1 magic numbers should also be refactored.