<?php
// testWtf.php        test script for Wtf() function
// P. Conrad for CISC103, sect 99, 11/20/2007


   require("wtf.php");


  //=======================================
  // define the tolerance 
  //=======================================
  
  // tolerance is "how far away from the expected value" the result
  // is allowed to be.    We are using values from a table with only
  // two decimal places of accuracy, so we are allowing our answer to be
  // off by as much as 0.02


  $tolerance = 0.02;

  //===================
  //  Run the tests 
  //=================== 

  //  Test 1

  $expected = 523.24;
  $actual = wtf(3);    // frequency of C above A
  $diff = abs($expected-$actual);

  if ($diff < $tolerance) 
    {
      print("test 1 passed\n");
    }
  else 
    {
      print("test 1 failed\n");
      print("expected=" . $expected . "\n");
      print("actual=" . $actual . "\n");
    }

  //  Test 2

  $expected = 391.99;
  $actual = wtf(-2); // convert 30 degrees Celsius to Fahrenheit
  $diff = abs($expected-$actual);

  if ($diff < $tolerance) 
    {
      print("test 2 passed\n");
    }
  else 
    {
      print("test 2 failed\n");
      print("expected=" . $expected . "\n");
      print("actual=" . $actual . "\n");
    }

?>