Figure 7. Method addIfPositive
 public int addIfPositive
 (int a, int b)
 {
 if (a >= 0 && b >= 0)
    return (a+b);
 return -1;
 }
public int addIfPositive
(int a, int b)
{
if (a >= 0 && b < 0)
    return (a+b);
return -1;
}
public int addIfPositive
(int a, int b)
{
if (a < 0 && b >= 0)
    return (a+b);
return -1;
}
Original Mutant #1 Mutant #2