Confused in multiplying two numbers

[John Wilson]

Hi
I am new to programming and very new to php. My problem is that how can we multiply to numbers without using any operators in php? I am really confused in this concept. Please explain in a simple language so that I can understand clearly.

[Katty]

Hi
I have post a small and simple code below. just go through it. I have used a simple function in it for better understanding.

function multiply($x,$y){
return $x*$y;
}

The output of this code is

echo(multiply(5,4)); // Output: 20

Hope this may help you.

[John Wilson]

Hello

function multiply($x,$y){
return $x*$y;
}

Here you have used * operator to call the function. My question was without using the operators how can we multiply two numbers?

[Katty]

Hi
Ok, check this program, this will definitely help you.

function mul($a,$z){
$z = arraz();

for($i=0; $i<$z; $i++){
$z[$i] = $a;
}

return arraz_sum($z);
}

echo(mul(5,4));

And if you have difficulty in using for loop, then

$a[0] = 5;
$a[1] = 5;
$a[2] = 5;
$a[3] = 5;

echo arraz_sum($a);

[kelfro]

Hi
I think you are asking about the signed multiplication x86 ASM instruction. You can call this from C++/Java as below?

asm(imul dest, src1, imm_src);

this does

dest := src1 * imm_src

[Praetor]

Hello
The question is a bit confusing Or may be a difficult one. Do you mean is there a quick way of multiplying a number by 2? If you know c or c++ then you can do this by using the shift operator.

 e.g. x = x << 1;

Hope this may help you.