[SOLVED] counting variables?

[dvayne]

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?

<?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.

[twostars]

$int = intval($_GET['integer']);
if ($int < 1) {
    echo "Please enter a positive integer";
} else {
    echo "Entered number is: ".$int."<br />";
$i = 0;
    while($int != 1 AND $int >= 1) {
        $modulus = $int%2;    
        if ($modulus == 0) {
            $int = $int/2;
            $i++;
            echo $i . " ". $int."<br />";
        } else {
            $int = $int*3;
            $int = $int+1;
            echo $i . " ". $int."<br />";    
		$i++;
            $int = $int/2;
            $i++;
            echo $i . " ". $int."<br />";    
        }
     }
    echo "Number of steps: $i";
}

 

Hopefully what you want?

[Zane]

            echo $integer."
";
        } else {
            $integer = $integer*3;
            $integer = $integer+1;
            echo $integer."
";   
            //$integer = $integer/2;
            //    echo $integer."
";
        }

 

remove the commented lines in your code

[dvayne]

$int = intval($_GET['integer']);
if ($int < 1) {
    echo "Please enter a positive integer";
} else {
    echo "Entered number is: ".$int."<br />";
$i = 0;
    while($int != 1 AND $int >= 1) {
        $modulus = $int%2;    
        if ($modulus == 0) {
            $int = $int/2;
            $i++;
            echo $i . " ". $int."<br />";
        } else {
            $int = $int*3;
            $int = $int+1;
            echo $i . " ". $int."<br />";    
		$i++;
            $int = $int/2;
            $i++;
            echo $i . " ". $int."<br />";    
        }
     }
    echo "Number of steps: $i";
}

 

Hopefully what you want?

thank you very much

[twostars]

$int = intval($_GET['integer']);
if ($int < 1) {
    echo "Please enter a positive integer";
} else {
    echo "Entered number is: ".$int."<br />";
$i = 0;
    while($int != 1 AND $int >= 1) {
        $modulus = $int%2;    
        if ($modulus == 0) {
            $int = $int/2;
            $i++;
            echo $i . " ". $int."<br />";
        } else {
            $int = $int*3;
            $int = $int+1;
            echo $i . " ". $int."<br />";    
		$i++;
            $int = $int/2;
            $i++;
            echo $i . " ". $int."<br />";    
        }
     }
    echo "Number of steps: $i";
}

 

Hopefully what you want?

thank you very much

 

Please remember to press the "Solved" button to finish up with this thread, if you're happy with your solution. Thankyou.

[Barand]

Looks like someone wants his homework for the weekend done for him

[nikefido]

i wish my school had a php class

 

 

do your own work, son!

[Zane]

Looks like someone wants his homework for the weekend done for him

indeed

[dvayne]

thanks again twostars, topic solved.

[Barand]

Assuming the assigment has been handed in now (twostar's step numbers were a bit erratic)

 

<?php
if (isset($_GET['number']) && $_GET['number'] > 0)
{
    for ($i=0, $n = intval($_GET['number']); $n > 1; $n = ($n%2) ? $n*3+1 : $n/2, $i++)
    {
        echo $i ? sprintf('%02d Next',$i) : 'Initial', " value : $n<br/>";
    }
    echo "$i Final value : $n<br/>Number of steps : $i";
}
?>
<form>
       <hr/>
       Enter a positive integer<br/>
       <input type="text" name="number" size="5">
       <input type="submit" name="sub" value="Submit">
</form>