使用oops概念制作一个php计算器类

Question

Hi guys i am trying to make a php calculator class which need to multiple numbers through fucntion like when user try to run like this through commpand line claculator.php add 2,3,4,5,6 and it should give output as 20 and it should allow add method to use a new line character as a number separator example calculator.php add 2 3,4

And it should allow defining what delimiter is used to separate numbers example: calculator.php add \\;\\2;3;4

And it should not accept negative numbers too.And if user pass number as more than 1000 it shouwld ignoe and give me the result exmaple php calculator.php add 10,20,1010,20 and it should ginore 1010 and give out put as 50

And i have tried this code which will accept only 2 parameters

 class Calculator {
    private $_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;
    }
}

$calc = new Calculator(3,4);
echo "<p>3 + 4 = ".$calc->add(). "</p>";

$calc = new Calculator (15,12);
echo "<p>15 - 12 = ".$calc->subtract(). "</p>";

$calc = new Calculator (20,2);
echo "<p> 20 * 2 = ".$calc->multiply(). "</p>";

$calc = new Calculator (20,2);
echo "<p> 20 / 2 = ".$calc ->divide(). "</p>";

Can anyone help me out how can i do those things

Thanks in advance.

Answer 1

I think this is what you looking for:

Calculator class

<?php

/**
 * Calculator class
 */
class Calculator
{
    const min = 0;
    const max = 1000;

    /**
     * Calculate the summation
     * @param Array $number
     * @return integer
     */
    public static function add( $numbers ){
        return array_sum( self::_filter_numbers( $numbers ) );
    }

    /**
     * Substract numbers
     * @param Array $numbers
     * @return integer
     */
    public static function subtract( $numbers ){
        $filtered_numbers = self::_filter_numbers( $numbers );
        $first_number = array_shift( $filtered_numbers );
        return ( $first_number - array_sum( $filtered_numbers ) );
    }

    /**
     * Calculate the product of the given numbers
     * @param Array $numbers
     * @return integer
     */
    public static function multiply( $numbers ){
        return array_product( self::_filter_numbers( $numbers ) );
    }


    /**
     * Divide the given numbers
     * @param Array $numbers
     * @return double
     */
    public static function divide( $numbers ){
        $filtered_numbers = self::_filter_numbers( $numbers );
        $first_number = array_shift( $filtered_numbers );
        return ($first_number / array_product( $filtered_numbers ));
    }


    /**
     * Filter Invalid numbers
     * @param Array $numbers
     * @return Array Valid Numbers
     */
    private static function _filter_numbers( $numbers ){
        return array_filter( $numbers, function( $number ){
            return self::_is_valid_number( $number );
        } );
    }

    /**
     * Check if the given number is in the interval [0, 1000]
     * @param integer $number
     * @return boolean
     */
    private static function _is_valid_number( $number ){
        return ( $number >= self::min && $number <= self::max );
    }
}

Tests

$test_numbers_1 = [ -2, -1, 0, 1, 2, 1000, 2000 ];
printf( "<h4>Test 1</h4>
" );
printf( "<p>Numbers: %s</p>
", implode( ',', $test_numbers_1 ) );
printf( "<p>Add: %d</p>
", Calculator::add( $test_numbers_1 ) );
printf( "<p>Substract: %d</p>
", Calculator::subtract( $test_numbers_1 ) );
printf( "<p>Multiply: %d</p>
", Calculator::multiply( $test_numbers_1 ) );
printf( "<p>Divide: %f</p>
", Calculator::divide( $test_numbers_1 ) );

$test_numbers_1 = [ -2, -1, 1, 2, 1000, 2000 ];
printf( "<h4>Test 2</h4>
" );
printf( "<p>Numbers: %s</p>
", implode( ',', $test_numbers_1 ) );
printf( "<p>Add: %d</p>
", Calculator::add( $test_numbers_1 ) );
printf( "<p>Substract: %d</p>
", Calculator::subtract( $test_numbers_1 ) );
printf( "<p>Multiply: %d</p>
", Calculator::multiply( $test_numbers_1 ) );
printf( "<p>Divide: %f</p>
", Calculator::divide( $test_numbers_1 ) );

Test results

<h4>Test 1</h4>
<p>Numbers: -2,-1,0,1,2,1000,2000</p>
<p>Add: 1003</p>
<p>Substract: -1003</p>
<p>Multiply: 0</p>
<p>Divide: 0.000000</p>
<h4>Test 2</h4>
<p>Numbers: -2,-1,1,2,1000,2000</p>
<p>Add: 1003</p>
<p>Substract: -1001</p>
<p>Multiply: 2000</p>
<p>Divide: 0.000500</p>