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> Counting Variables?
dvayne
post Jan 12 2008, 01:23 AM
Post #1


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Write a php script that will accept a positive integer, if it is even, divide it by 2 and if it is odd, multiply it by 3 and add 1. Repeat the process until the value is 1, printing out each value. Finally print out how many of these operations you performed. If the input value is less than 1, print error and perform an exit();

For example:
Initial value: 9
Next value: 28
Next value: 14
Next value: 7
Next value: 22
Next value: 11
Next value: 34
Next value: 17
Next value: 52
Next value: 26
Next value: 13
Next value: 40
Next value: 20
Next value: 10
Next value: 5
Next value: 16
Next value: 8
Next value: 4
Next value:2
Final value:1
Number of steps: 19


Could you please modify this code?
CODE
<?php
$integer = intval($_GET['integer']);
if ($integer < 1) {
    echo "Please Enter a Positive Integer";
} else {
    echo "Entered Number is: ".$integer."<br />";
    while($integer != 1 AND $integer >= 1) {
        $modulus = $integer%2;    
        if ($modulus == 0) {
            $integer = $integer/2;
            echo $integer."<br />";
        } else {
            $integer = $integer*3;
            $integer = $integer+1;
            echo $integer."<br />";    
            $integer = $integer/2;;
                echo $integer."<br />";    
        }
    }
}
?>


Any help would be appreciated.

This post has been edited by dvayne: Jan 12 2008, 01:24 AM

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jlhaslip
post Jan 12 2008, 01:31 AM
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what class is the assignment for?
This reeks of homework.

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gogoily
post Jan 12 2008, 03:07 AM
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Try the following codes:
CODE
<?php
$step = 0;
$integer = intval($_GET['integer']);
if ($integer < 1) {
    echo "Please Enter a Positive Integer";
} else {
    echo "Entered Number is: ".$integer."<br />";
    while($integer != 1 AND $integer >= 1) {
        $modulus = $integer%2;    
        if ($modulus == 0) {
            $integer = $integer/2;
            echo $integer."<br />";
        } else {
            $integer = $integer*3;
            $integer = $integer+1;
            echo $integer."<br />";    
        }
        $step++;
    }
}
echo "Total step: ".$step;
?>

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dvayne
post Jan 13 2008, 03:24 AM
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thanks
whats the difference between your code with this code?

CODE
<?php
$step = 0;
$integer = intval($_GET['integer']);
if ($integer < 1) {
    echo "Please Enter a Positive Integer";
} else {
    echo "Entered Number is: ".$integer."<br />";
    while($integer != 1 AND $integer >= 1) {
        $modulus = $integer%2;    
        if ($modulus == 0) {
            $integer = $integer/2;
            echo $integer."<br />";
        } else {
            $integer = $integer*3;
            $integer = $integer+1;
            echo $integer."<br />";  
                   $integer = $integer/2;
                   echo $integer."<br />";  
        }
        $step++;
    }
}
echo "Total step: ".$step;
?>

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gogoily
post Jan 17 2008, 09:30 AM
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See 16 and 17 line in your codes wink.gif

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