public class Tools 
{
    public static int sum(int a, int b)
    {
        int s, i;  // Help variables used to write program
        
        s = 0;     // s = current total
        
        for (i = a; i <= b; i++ )
            s = s + i;       // Add next number to total
            
        return s;  // Return the total as output
    }
}