PHP Dubble For Loop

Question

I need to make a loop in php that says 1*9 = 9 2*9 = 18 and 1*8 = 8 and 1*7 = 7 etc in loop so the result will be this:

1*7 = 7
2*7 = 14
3*7 = 21
1*8 = 8
2*8 = 16
3*8 = 24
1*9 = 9
2*9 = 18
3*9 = 27

And I need to use a nested loop for that i tried some things out but i cant get it to work here is what is did. But for the most part i don't really understand what nested loops do and what there used for. hope you can help me thanks!

    for ($tafel7 = 0; $tafel7 <= 9; $tafel7++) {
        for($tafel7 = 0; $tafel7 <= 9; $tafel7++){
            for($tafel7 = 0; $tafel7 <= 9; $tafel7++){

            $antwoord9 = $tafel7 * 9;
            echo "$tafel7 x 8 = $antwoord9 <br>";

            $antwoord8 = $tafel7 * 8;
            echo "$tafel7 x 8 = $antwoord8 <br>";

            $antwoord7 = $tafel7 * 7;
            echo "$tafel7 x 7 = $antwoord7 <br>";


            };
        };
    };

Clarify what are you trying to achieve. You can just provide input parameters. — Bhavik Shah
– Bhavik Shah, Commented Nov 21, 2016 at 7:23
bly jy het reg gekom, al was ek die eerste ou wat gehelp het. — Marius Brits
– Marius Brits, Commented Nov 21, 2016 at 8:22

d3p4n5hu · Accepted Answer · 2016-11-21 07:28:57Z

Your question is not as clear but if you just want the exact result, here's the code:

for($i = 7; $i <= 9; $i++){
    for($j = 1; $j <= 3; $j++){
        $result = $i * $j;
        echo $j." * ".$i." = ".$result."<br>";
    }
}

If you need to print complete tables, then try this:

for($i = 1; $i <= 9; $i++){
    for($j = 1; $j <= 10; $j++){
        $result = $i * $j;
        echo $i." * ".$j." = ".$result."<br>";
    }
}

As far as the explanation is concerned, then listen:

A normal loop works by executing a block of statement(s) again and again until a condition is met. So, nested loops are basically loops in another loop. This means that the block of code will be executed 'n' number of times by the inner loop, and then the inner loop will again be executed by the outer loop, again 'n' number of times. 'n' means whatever the number of times the conditions are met for the respective for loops. Hope you got my explanation!

bradynpoulsen · Accepted Answer · 2016-11-21 07:26:50Z

0

You need to loop over your two variables, (1) the left operand and (2) the right operand

for ($right = 7; $right <= 9; $right++) {
    for ($left = 1; $left <= 3; $left++) {
        $product = $left * $right;
        echo "{$left} x {$right} = {$product} <br>";
    }
}

answered Nov 21, 2016 at 7:26

bradynpoulsen

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Comments

Marius Brits · Accepted Answer · 2016-11-21 08:02:59Z

0

In this example, I have to loops one with the times table you want eg 7, 8 and 9 "tafel" and the other one with how many times you want it to run for each times table "$hoeveel". This can easily be altered to more times tables or how many times you want to run, you also only need to export the values once as it cycles through the loops anyways. Hope it helps.

for ($tafel = 7; $tafel <= 9; $tafel++) {
    for ($hoeveel = 1; $hoeveel <= 3; $hoeveel++) {
        $antwoord = $tafel * $hoeveel;
        echo "$tafel x $hoeveel = $antwoord <br>";
    }
}

edited Nov 21, 2016 at 8:02

answered Nov 21, 2016 at 7:23

Marius Brits

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3 Comments

Marius Brits Over a year ago

I made it use the 7,8 and 9 times table and only does the first 3 of each you can always change the values, you were using the same variables and to many nested loops.

Loko Over a year ago

I'd upvote this answer if you edit the answer explaining what happens with this code, since OP has no clue what he's doing with his nested for loops at the moment.

Marius Brits Over a year ago

sorry about that changed it to give a bit more explanation

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