x86 Assembly Language Instructions Quiz

16 Questions

Which instruction reads a 32-bit integer from standard input and returns it in the EAX register?

ReadInt

What is the purpose of the SetTextColor instruction?

Set foreground and background colors for text output

Which operation manipulates a last-in-first-out data structure?

Push

What does the WaitMsg instruction do?

Pause the program until the user presses Enter key

Which instruction writes a null-terminated string to standard output?

WriteString

What should be in the EDX register when using the WriteDec instruction?

Offset where the string is stored

What is the purpose of ending a label with a double colon?

To limit the scope of the label to the current procedure

Which method is commonly used for passing parameters between programs or procedures?

Passing arguments in registers

What is the representation of True and False in Booleans?

1 for True and 0 for False

What does the Zero flag indicate in the Flags Register?

Result of an operation is zero

When is the Carry flag set in the Flags Register?

Result of an unsigned arithmetic too large

What flag indicates a negative result in the Flags Register?

Sign flag

What does the CrLf function do?

Advances the cursor to the beginning of the next line.

Which register stores the delay time in milliseconds in the Delay function?

EAX

What is the purpose of the GetCommandTail function?

Copies the program command line into a null-terminated string.

What does the ReadChar function do?

Reads a single character from standard input.

Study Notes

Input and Output Instructions

The ReadInt instruction reads a 32-bit integer from standard input and returns it in the EAX register.
The WriteString instruction writes a null-terminated string to standard output.
The ReadChar function reads a character from standard input.

Terminal Operations

The SetTextColor instruction sets the text color.
The CrLf function inserts a carriage return and line feed.
The WaitMsg instruction waits for a message from the operating system.

Flags Register

The Zero flag indicates whether the result of an operation is zero.
The Carry flag is set when an operation results in a carry or borrow.
The Negative flag indicates a negative result in the Flags Register.

Functions

The Delay function pauses program execution for a specified time, stored in the ECX register in milliseconds.
The GetCommandTail function retrieves the command tail.

Data Structures and Boolean

The Push and Pop operations manipulate a last-in-first-out (LIFO) data structure.
In Boolean, True is represented as 1 and False as 0.

Assembly Language

Ending a label with a double colon (::) is a way to define a label in assembly language.
The WriteDec instruction requires the value to be written in the EDX register.

Test your knowledge of x86 assembly language instructions by identifying the functions of commands like CrLf, Delay, DumpMem, DumpRegs, and GetCommandTail. Understand how these instructions are used to manipulate memory and registers in hexadecimal format.

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