JavaFX Variable

There are two type of variables in JavaFX. The first is def. def means that the variable won't change through all of the program running, or in other words it means that def is for declaring a constant:

def name = "lady gaga";

def code = 45;

def sleep = false;

While var is for declaring a variable that may be change over program running.

var name;

var code;

var sleep;

To display var or def, use curly bracket:

println("Hello, {name}");
 

JavaFX Variable

The First JavaFX Application

Here's a code of JavaFX:

import javafx.stage.Stage;

import javafx.scene.Scene;

import javafx.scene.text.Text;

import javafx.scene.text.Font;

Stage {

    title: "The First JavaFX App"

    scene: Scene {

        width: 400

        height: 300

        content: [

            Text: {

                font: Font {

                    size: 30

                }

                x: 10

                y: 10

                content: "Application Content"

            }

        ]

    }

}

      

The First JavaFX Application

Assembly CMP and JNZ

This is the second type of use CMP with comparison. JNZ is a command that tell the program to jump is comparison result is not equal. If equal, please don't jump.

start:

    MOV AH,08    ; Function to read char from keyboard

    INT 21h      ; and save it to AL

    CMP AL,65    ; Compare what valu in AL to "A"

    JNZ output   ; if not same (not zero), please jump and 

                 ; skip middle. If zero, please run code normally

middle:

    MOV AH,02    ; Function to output char

    MOV DL,"R"   ; Char to output

    INT 21h

output:

    MOV AH,02    ; Function to output char

    MOV DL,"T"   ; Char to output

    INT 21h

exit:

   MOV AH,4Ch    ; Exit function

   MOV AL,00     ; Return 0

   INT 21h

 
If you type "A", it means that the comparison is same, and the command is JUMP IF NOT EQUAL, so the result is that the code will executed normally:

output> RT

But if you type other than "A", it means that the comparison result is not equal to zero (not same), and the command is JUMP IF NOT EQUAL, so the result is that the program will jump to output and skip middle label:
output> T

Assembly CMP and JNZ

Assembly CMP and JZ

JZ is a jump command. It tell the program to jump if zero. Zero means that the two value in CMP in quantities is equal (if it subtracted, the result is zero).

start:

    MOV AH,08    ; Function to read keyboard input

    INT 21h      ; and save it to AL

    CMP AL,65    ; Compare what saved in AL by 65 ("A")

    JZ output    ; If result of CMP is "ZERO" (same as "A"),  

                 ; jump to output and skip middle.

middle:

    MOV AH,02    ; Function to output char

    MOV DL,"N"   ; Char to output

    INT 21h

output:

    MOV AH,02    ; Function to output char

    MOV DL,"M"   ; Char to output

    INT 21h

exit:

    MOV AH,4Ch   ; Function to exit

    MOV AL,00     ; return 0

    INT 21h

If you type "A", then it will skip middle label

output> N

But if you type other than "A", then the output is:
output> NM

Assembly CMP and JZ

Assembly Reading Keyboard Input

To read a keyboard input, here's a code to do it:

MOV AH,08    ; Function to read a char from keyboard

INT 21h      ; the char saved in AL

MOV AH,02    ; Function to display a char  

MOV DL,AL    ; Copy a saved char in AL to DL to output it

INT 21h

MOV AH,4Ch   ; Function to exit

MOV AL,00    ; Return 00

INT 21h

Assembly Reading Keyboard Input

Assembly Label And JMP

Showing a code for label and JMP. Label just a name to sign block of code. And JMP is a code to jump to specified of label.

start:

    MOV AH,02    ; Function to output char

    MOV DL,"A"   ; Character to output

    INT 21h      ; Call interupt to output char

    JMP output

    MOV AH,02    ; Function to output char

    MOV DL,"B"   ; Character to output

    INT 21h      ; Call interupt to output char

output:

    MOV AH,02    ; Function to output char

    MOV DL,"C"   ; Character to output

    INT 21h      ; Call interrupt to output char

end:

    MOV AH,4Ch   ; Function to exit

    MOV AL,00    ; Return 0

    INT 21h

output>> AC

The yellow background never be printed, because JMP command tell the program to jump to "output" label
          

Assembly Label And JMP

Output For Char In Assembly

Here's a bit of code on how to display a char to screen in x86 processor:

MOV AH,02    ; Function to output a char

MOV DL,"A"   ;  Character to output and copy it to DL

INT 21h      ; Call windows interupt to output "A"

MOV AH,4Ch   ; Function to exit

MOV AL,00    ; Copy 00 to AL, Return 0

INT 21h      ; Call interupt to exit  

 

Output For Char In Assembly