Concatenation Help

[IrwinMFletcher]

Hello,

I am new to PHP and am having a bit of trouble with what I am sure is a very simple thing.

I am taking an online course and working on a simple project to build a calculator. What is wrong with this line of code?

echo $_GET[“num1”] . " plus " . $_GET[“num2”] . " equals: " $result1 + $result2;

The problem is with $result1 + $result2

I am trying to get an output like this:

1 plus 2 equals: 3

If I move the $result1 + $result2 down to the next line it seems to work but not when it is on the same line.

Thanks for your help!

Joe

[johnphpnewb]

echo $_GET[“num1”] . " plus " . $_GET[“num2”] . " equals: " $result1 + $result2;

if you use code highlighting, like that which is provided by surrounding php code in code blocks,then you should see that you are missing the last string concatenator:

echo $_GET[“num1”] . " plus " . $_GET[“num2”] . " equals: " . $result1 + $result2;

the final full-stop/period/dot should solve your problem, unless, you haven’t set up the rest of your code without errors.

[IrwinMFletcher]

Hi John,

Thanks for the reply.

I did try adding the extra . but now I get this error:

Notice : A non well formed numeric value encountered in C:\xampp\htdocs\sandbox\15.php on line 34

Here is the full code:

<?php
	if (isset($_GET['submit'])) {
		$result1 = $_GET['num1'];
		$result2 = $_GET['num2'];
		$operator = $_GET['operator'];

		switch ($operator) {
			case "None":
				echo "You need to select a method!";
				break;
			case "Add":
				echo $_GET["num1"] . " plus " . $_GET["num2"] . " equals: " . $result1 + $result2;
				echo  $result1 + $result2;
				break;
			case "Subtract":
				echo $result1 - $result2;
				break;
			case "Multiply":
				echo $result1 * $result2;
				break;
			case "Divide":
				echo $result1 / $result2;
				break;	
		}
	}
?>

[benanamen]

Start with getting rid of the variables for nothing. As far as what your doing, you need to put parenthesis around the last two variables

echo $_GET["num1"] . " plus " . $_GET["num2"] . " equals: " . ($result1 + $result2);

[IrwinMFletcher]

Thanks Benanamen! The ( )'s were the answer!