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Automatically solve arithmetic problems - give it to your son to practice quick calculations o(∩_∩)o

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Release： 2016-07-25 08:49:51
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1012 people have browsed it
Custom range, custom operator, custom number of operations. So cool
  2. /**
  3. * Description of QuestionEngine
  4. * A question engine
  5. *
  6. * @author lyc
  7. * @copyright (c) 2013, Unary Inc.
  8. */
  9. class QuestionEngine {
  11. /**
  12. * Question scope
  13. * @var string $scope
  14. */
  15. public $scope = array(1, 100);
  17. /**
  18. * Operators included, if there are multiple operators, the question will be mixed
  19. * @var string $operators
  20. */
  21. public $operators = '+-';
  23. /**
  24. * Number of operations
  25. * @var int
  26. */
  27. public $optTimes = 1;
  29. public function generate() {
  30. //Generate a set of values ​​​​according to the number of operations
  31. start:
  32. for ($index = 0; $index < $this->optTimes + 1; $index++) {
  33. $elements[] = $this->randomValue();
  34. }
  35. $operatorType = strlen( $this->operators); //There are several operators to choose from
  36. //Start assembling the calculation
  37. $question = '';
  38. for ($index = 0; $index < count($elements); $index++ ) {
  39. $question.=' ' . $elements[$index] . ' '; //Put a number in
  40. if ($index < count($elements) - 1)//If it is not the last number, Add an operator at the end
  41. $question.=substr($this->operators, mt_rand(0, $operatorType - 1), 1);
  42. }
  44. eval('$anwser = ' . $question . '; ');
  45. if ($anwser < 0) { //Exclude the case where the result is a negative number
  46. $elements = array();
  47. goto start; //Requires PHP5.3 support
  48. }
  50. echo "$question= " . $anwser;
  51. }
  53. /**
  54. * Generate a random value within a range
  55. *
  56. * @return int
  57. */
  58. protected function randomValue() {
  59. return mt_rand($this->scope[0], $this->scope[1]);
  60. }
  62. }
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  2. include 'QuestionEngine.class.php';
  3. $hello = new QuestionEngine();
  4. $hello->generate();
  5. ?>
  7. Result: 26 + 85 = 111
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Related labels：
自动化出算术题-拿给儿子练速算吧 o(∩_∩)o
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