In PHP I need to add the min() and max() functions to the Calculator class and p
ID: 3805945 • Letter: I
Question
In PHP I need to add the min() and max() functions to the Calculator class and program output. Not sure where it goes or how to add it here is what I have so far:
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Extending the Calculator class</title>
<link rel="stylesheet" type="text/css" href="common.css" />
</head>
<body>
<h2>Extending the Calculator class</h2>
<?php
class Calculator {
protected $_val1, $_val2;
public function __construct( $val1, $val2 ) {
$this->_val1 = $val1;
$this->_val2 = $val2;
}
public function add() {
return $this->_val1 + $this->_val2;
}
public function subtract() {
return $this->_val1 - $this->_val2;
}
public function multiply() {
return $this->_val1 * $this->_val2;
}
public function divide() {
return $this->_val1 / $this->_val2;
}
}
class CalcAdvanced extends Calculator {
private static $_allowedFunctions = array( "pow" => 2, "sqrt" => 1, "exp" => 1 );
public function __construct( $val1, $val2=null ) {
parent::__construct( $val1, $val2 );
}
public function __call( $methodName, $arguments ) {
if ( in_array( $methodName, array_keys( CalcAdvanced::$_allowedFunctions ) ) ) {
$functionArguments = array( $this->_val1 );
if ( CalcAdvanced::$_allowedFunctions[$methodName] == 2 ) array_push(
$functionArguments, $this->_val2 );
return call_user_func_array( $methodName, $functionArguments );
} else {
die ( "<p>Method 'CalcAdvanced::$methodName' doesn't exist</p>" );
}
}
}
$ca = new CalcAdvanced( 3, 4 );
echo "<p>3 + 4 = " . $ca->add() . "</p>";
echo "<p>3 - 4 = " . $ca->subtract() . "</p>";
echo "<p>3 * 4 = " . $ca->multiply() . "</p>";
echo "<p>3 / 4 = " . $ca->divide() . "</p>";
echo "<p>pow( 3, 4 ) = " . $ca->pow() . "</p>";
echo "<p>sqrt( 3 ) = " . $ca->sqrt() . "</p>";
echo "<p>exp( 3 ) = " . $ca->exp() . "</p>";
?>
</body>
</html>
Explanation / Answer
I have added it, have a look.
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Extending the Calculator class</title>
<link rel="stylesheet" type="text/css" href="common.css" />
</head>
<body>
<h2>Extending the Calculator class</h2>
<?php
class Calculator {
protected $_val1, $_val2;
public function __construct( $val1, $val2 ) {
$this->_val1 = $val1;
$this->_val2 = $val2;
}
public function add() {
return $this->_val1 + $this->_val2;
}
public function subtract() {
return $this->_val1 - $this->_val2;
}
public function multiply() {
return $this->_val1 * $this->_val2;
}
public function divide() {
return $this->_val1 / $this->_val2;
}
public function min() {
if ($this->_val1 > $this->_val2)
return $this->_val2;
return $this->_val1
}
public function max() {
if ($this->_val1 > $this->_val2)
return $this->_val1;
return $this->_val12
}
}
class CalcAdvanced extends Calculator {
private static $_allowedFunctions = array( "pow" => 2, "sqrt" => 1, "exp" => 1 );
public function __construct( $val1, $val2=null ) {
parent::__construct( $val1, $val2 );
}
public function __call( $methodName, $arguments ) {
if ( in_array( $methodName, array_keys( CalcAdvanced::$_allowedFunctions ) ) ) {
$functionArguments = array( $this->_val1 );
if ( CalcAdvanced::$_allowedFunctions[$methodName] == 2 ) array_push(
$functionArguments, $this->_val2 );
return call_user_func_array( $methodName, $functionArguments );
} else {
die ( "<p>Method 'CalcAdvanced::$methodName' doesn't exist</p>" );
}
}
}
$ca = new CalcAdvanced( 3, 4 );
echo "<p>3 + 4 = " . $ca->add() . "</p>";
echo "<p>3 - 4 = " . $ca->subtract() . "</p>";
echo "<p>3 * 4 = " . $ca->multiply() . "</p>";
echo "<p>3 / 4 = " . $ca->divide() . "</p>";
echo "<p>pow( 3, 4 ) = " . $ca->pow() . "</p>";
echo "<p>sqrt( 3 ) = " . $ca->sqrt() . "</p>";
echo "<p>exp( 3 ) = " . $ca->exp() . "</p>";
echo "<p>max( 3, 4 ) = " . $ca->max() . "</p>";
echo "<p>min( 3, 4 ) = " . $ca->min() . "</p>";
?>
</body>
</html>
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