Division with some decimal

[skimask]

Hi to everybody! I would have the necessity to perform the following division in PIC Basic, but I don't know from how stings to depart.
A = B / 5,58 B is a constant
I would have the necessity to visualize the result on a display LCD also visualizing 2 decimal. Can someone help me? Thanks everybody

You do know that PBP does NOT deal with fractions and decimals...right?

a var word
b var word
'start with a number in b
1 - b = 655 ' maximum value in b is 655, otherwise word variable b will overflow
2 - b = b * 100 'shift the decimal point over to right 2 places temporarily
3 - a = b / 558 'constant value of 5.58 also has it's decimal point shifted over by 2 places

1 - b = 655 (given)
2 - b = 65500 (closest you can get without overflowing a word value)
3 - a = 117 ( 65500 / 558, PBP doesn't do fractions)

Do a search on 'decimal' and 'fraction' here and you'll find some stuff. Otherwise, download the floating point math routines from microchip if you need good accuracy.

[BigWumpus]

While B is a constant,
just type it to your desktop-calculator and place the result inside a LCDOUT-command. ;-)

Because, if B is a constant and 5,58 too - the result "A" is another constant. You don't need any calculation in runtime...

[skimask]

While B is a constant,
just type it to your desktop-calculator and place the result inside a LCDOUT-command. ;-)

Because, if B is a constant and 5,58 too - the result "A" is another constant. You don't need any calculation in runtime...

Oh..Hey...Good point!
Missed that entirely! DOH!
That really would save a lot of calculation time wouldn't it...

[Darklakebridge7]

Hi boys!

I have been wrong to expose the problem!

I would have the necessity to divide the variable "B" for the number 5,58 and subsequently to visualize the result "A" on LCD.

My very problem is the following:

A = B / 5,58

Excuse the error! Everybody can help me??

[rossfree]

Not knowing the size of B, I've used DIV32. B can be any integer up to 65534.

A VAR WORD
B VAR WORD


A = B * 100 'A is temporary storage of computation
A = DIV32 558 'using DIV32... B can be any integer up to 65534
A = A / 100 'final result is placed in variable A as an integer... any
'remainder will be discarded.

Hope this helps,

Ross

[Darklakebridge7]

Not knowing the size of B, I've used DIV32. B can be any integer up to 65534.

A VAR WORD
B VAR WORD


A = B * 100 'A is temporary storage of computation
A = DIV32 558 'using DIV32... B can be any integer up to 65534
A = A / 100 'final result is placed in variable A as an integer... any
'remainder will be discarded.

Hope this helps,

Ross

Thank you Ross!

Thanks for your fast answer!

The routine works, but I would have the necessity to visualize on LCD the data drawn with 2 decimal.

Would you know how to help me?

[mister_e]

Tip: use DIG and DEC modifier with LCDOUT.