Activity 5 Loops

Problem 1

Write a PHP script that will output the following using loop

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

Solution:

$asterisk = "* ";
for ($i = 0; $i < 5; $i++) {
    echo $asterisk;
    $asterisk .= "* ";
    echo "< br>";
}

Output:

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

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Problem 2

Write a PHP script that will output the following using loop

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

Solution:

for ($i = 0; $i < 5; $i++) {
    for ($j = 0; $j <= $i; $j++) {
        echo "* ";
    }
    echo "< br>";
}
for ($i = 5; $i > 0; $i--) {
    for ($j = 0; $j < $i; $j++) {
        echo "* ";
    }
    echo "< br>";
}

Output:

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

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Problem 3

Create a script using a for loop to add all the integers between 0 and 10 and display the total. The range should be user inputted.

Solution:

if (isset($_GET["num1"])) {
    $user = $_GET["num1"];

    $sum = 0;
    for ($i = 0; $i <= $user; $i++) {
        $sum += $i;
    }
    echo "Sum between 1 to $user is: $sum";
}

else {
    echo"< p>Missing variable name parameter. Variable ‘num1’ does not exist.< /p>";
}

DEMO 1

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Problem 4

Write a PHP script that creates the following table (use for loops)

Solution:

echo "< table border='1'>";
for ($i = 1; $i <= 10; $i++) {
    echo "< tr>";
    for ($j = $i; $j <= $i * 10; $j += $i) {
        echo "< td> $j < /td>";
    }
    echo "< br>";
}

Output:

1	2	3	4	5	6	7	8	9	10
2	4	6	8	10	12	14	16	18	20
3	6	9	12	15	18	21	24	27	30
4	8	12	16	20	24	28	32	36	40
5	10	15	20	25	30	35	40	45	50
6	12	18	24	30	36	42	48	54	60
7	14	21	28	35	42	49	56	63	70
8	16	24	32	40	48	56	64	72	80
9	18	27	36	45	54	63	72	81	90
10	20	30	40	50	60	70	80	90	100