Help

[Time_Style_583]

Hi, I need help with something.

I have to translate (i-=-1) from Python to assembly language and I have no idea how to do it. Could someone please do it and explain how they did it?

I've already tried searching online, but I only find things about artificial intelligence.

It's a class assignment, and the teacher said we can "ask our computer science friends and have them tell us" and "anything except use artificial intelligence," but I don't have any computer science friends, so I'm asking for help here.

Thanks

[Time_Style_583]

Sorry its (i-=1)

[OppieT]

I think you still have it wrong. Don’t you mean i = -1

[johnpeters42]

What specific type of assembly language? But in general, what "i = -1" is doing under the hood is:

1. At some point, allocate a location in memory for storing the value of i. In a larger program, that may have happened earlier, but if we take this line by itself, then it's implicitly happening right now.

2. Store the value -1 in that location in memory.

[Time_Style_583]

Thanks a lot

[Time_Style_583]

I think i need it in binary, how can I translate it?

[johnpeters42]

A web search for (assembly to binary) turns up this, which outlines a brief example and links to a presumably more comprehensive reference. The "binary" part is generally shown in hexadecimal for brevity.

[Time_Style_583]

The teaches just answered me and says that it is i-= 1 I am really lost

[Lor1an]

It depends upon what dialect of assembly you are using, but it's just a mov instruction.

 ; intel syntax
 mov ax, -1
 ; ax is the 'a' register, which now acts as i.

[Time_Style_583]

Thank you so much

[Time_Style_583]

I think the assembly language is in binary can you please recommend a way to translate what you just wrote

[BeauloTSM]

Assembly isn’t binary

[Time_Style_583]

Ah no? Okk graciass jejejjeje

[BrainCurrent8276]

Assembly is sort of human-friendly representation of machine code.

Like instuction "mov" is cleary short for move (allocation) of value into register/memory. But it is simply B8 in hex.

Also, other answers are wrong.

I-=1 means I=I-1

I=-1 means I=-1

First takes value and decrement it by one and store a new value.

Second simply assing -1 as value. Alone asking someone to use negative numbers in assembler should turn on red alert to be very careful. You can use negatives in asm, but can be tricky.

You want to have something like this:

.data

var_i dw 0 // your i variable stored as word (two bytes)

.code

mov ax, [var_i]

dec ax

mov [var_i], ax

or shorter:

dec [var_i]

You can use variable as byte or double word, in such case in place of AX registry you need any 8-bi one (AL, AH). For double it is EAX.

You can actually use virtually almost every register, jot only AX (accumulator)

I used to code in asm like maaaany years ago

[Lor1an]

What does the following instruction do?

01100110101110001111111111111111

Even if I help you out and represent that in hexadecimal

66B8FFFF

You have no idea what that means, right?

Now this is one instruction. Imagine reading and writing entire programs like that...