Math Help

[onestcoder]

$x = 1.87 * 1.5 * 73 + 9.40 * 1.5 * 24 + 4.03 * 3 / 100

This should equal 5.55255 BUT it returns 543.2859

[onestcoder]

OK it doent like the string. Works like this:

$x = 1.87 * 1.5 * 73
$x2 = 9.40 * 1.5 * 24
$x3 = 4.03 * 3
$x4 = $x + $x2 + $x3
$x5 = $x4 / 100

MsgBox(-1, $x5, $x5)

Is there a way to write this on 1 line?

[Yashied]

OK it doent like the string. Works like this:

$x = 1.87 * 1.5 * 73
$x2 = 9.40 * 1.5 * 24
$x3 = 4.03 * 3
$x4 = $x + $x2 + $x3
$x5 = $x4 / 100

MsgBox(-1, $x5, $x5)

Is there a way to write this on 1 line?

$x = (1.87 * 1.5 * 73 + 9.40 * 1.5 * 24 + 4.03 * 3) / 100

[oMBRa]

$x = (1.87 * 1.5 * 73 + 9.40 * 1.5 * 24 + 4.03 * 3) / 100

you've beaten me on time

@OP

$x = 1.87 * 1.5 * 73 + 9.40 * 1.5 * 24 + 4.03 * 3 / 100 = 543.2859

[Melba23]

onestcoder,

Your maths syntax is very anbiguous. You should always clearly show, by the use of parentheses, the order in which the operators are to be applied - if not the compiler uses its own priority listing. From the Help File:

When more than one operator is used in an expression the order in which things happen is controlled by operator precedence.  The precedence used in AutoIt is given below.  Where two operators have the same precedence the expression is evaluated left to right.

From highest precedence to lowest:

    NOT
    ^
    * /
    + -
    &
    < > <= >= = <> ==
    AND OR 

e.g. 2 + 4 * 10 is evaluated as 42:

    4 * 10  (equals 40)

    2 + 40  (equals 42)

As the * has a higher precedence than + it occurs before the addition.

So your line should read:

$x = ((1.87 * 1.5 * 73) + (9.40 * 1.5 * 24) + (4.03 * 3)) / 100

and then you get the "correct" answer!

M23

[CodyBarrett]

but what about bedmas? it shouldn't need the brackets... should it

[Yashied]

$x = ((1.87 * 1.5 * 73) + (9.40 * 1.5 * 24) + (4.03 * 3)) / 100

((1.87 * 1.5 * 73) + (9.40 * 1.5 * 24) + (4.03 * 3)) / 100 = (1.87 * 1.5 * 73 + 9.40 * 1.5 * 24 + 4.03 * 3) / 100

Multiplication (division) ALWAYS has preoritet over addition (subtraction). This is mathematics (Grade ~3). There's no need to read the help file.

[Melba23]

Yashied,

My mathematics teachers of long, long ago taught me to use parentheses to avoid any possible confusion.

The OP was confused - using parentheses removes the confusion.

I just used more of them than you did!

CodyBarrett,

I have never come across "bedmas" before - I will try to remember it.

M23

[Yashied]

The OP was confused - using parentheses removes the confusion.

I just used more of them than you did!

I understand it, just OP so better remember.

[onestcoder]

Thank you very much (Yashied, Melba23, CodyBarrett, oMBRa)

[tarquinn]

Yashied,

My mathematics teachers of long, long ago taught me to use parentheses to avoid any possible confusion.

The OP was confused - using parentheses removes the confusion.

I just used more of them than you did!

CodyBarrett,

I have never come across "bedmas" before - I will try to remember it.

M23

I've never heard of bedmas, what's the B? Brackets?

I've always been taught PEMDAS. Parenthesis, etc..

[CodyBarrett]

its Gr3 math in canada

B rackets

E xponents

D ivision

M ultiplication

A dding

S ubtracting

... not sure if it applies to programming though.. but up there it does