Nested while loop

Pluchies · October 8th, 2014, 05:13 AM

For a school asignment i need to make several patterns using nested for/while/dowhile loops.

But i really can't find what i'm doing wrong, nor is the school of any help..
I was hoping people here could assist me understanding the language. Because so far it hardly makes any sence to me.

This is the code so far:

Code:

    <?php
    $row2 = 1;
    $col2 = 1;


    for ($row = 1; $row <= 5; $row++)
    {
        for ($col = 1; $col <= 10; $col++)
        {
            echo "*";
        }

        echo "<br />";
    }

    echo "<br />";

    while ($row2 <= 5) 
        {
        while ($col2<=10) {
            echo "*";
            $col2++;
        }
        echo "<br />*";
        $row2++;
    }

    ?>

The nested for loop works fine!! (proud of myself... ), but the while loop isn't working and i can't figure out why.

this was supposed to be the result:
**********
**********
**********
**********
**********
but instead i get this:

**********
*
*
*
*
*

Anybody willing to help me?:)

Pluchies · October 8th, 2014, 06:14 AM

so i kept going with my assignment, and i managed to get the same WRONG result twice..

Code:

    do
    {
        do
        {
            echo "*";
            $col3++;
        } while ($col3 <= 10);

        echo "<br />";
        $row3++;
    } while ($row3 <= 5);
    ?>

minang · October 14th, 2014, 02:02 AM

Just my thought. Since you increment the value in $col2 to 11 in
while ($col2<=10) {
echo "*";
$col2++;
}

So, the $col2 will have a value of 11. And if go to the next iteration in
while ($row2 <= 5)
{
while ($col2<=10) {
echo "*";
$col2++;
}
echo "<br />*";
$row2++;
}

the $col2<=10 condition is always false, and it will never go into that loop. My guess, you need to add as follow to "reset" $col2 to 1:
while ($row2 <= 5)
{
while ($col2<=10) {
echo "*";
$col2++;
}
echo "<br />*";
$col2=1; <---- add this
$row2++;
}

Quote:

Originally Posted by Pluchies

For a school asignment i need to make several patterns using nested for/while/dowhile loops.

But i really can't find what i'm doing wrong, nor is the school of any help..
I was hoping people here could assist me understanding the language. Because so far it hardly makes any sence to me.

This is the code so far:

Code:

    <?php
    $row2 = 1;
    $col2 = 1;


    for ($row = 1; $row <= 5; $row++)
    {
        for ($col = 1; $col <= 10; $col++)
        {
            echo "*";
        }

        echo "<br />";
    }

    echo "<br />";

    while ($row2 <= 5) 
        {
        while ($col2<=10) {
            echo "*";
            $col2++;
        }
        echo "<br />*";
        $row2++;
    }

    ?>

The nested for loop works fine!! (proud of myself... ), but the while loop isn't working and i can't figure out why.

this was supposed to be the result:
**********
**********
**********
**********
**********
but instead i get this:

**********
*
*
*
*
*

Anybody willing to help me?:)