"Hello,world" Advanced Assembler Series

Selection branch of TITLE ***hello,world Advanced Program by lluct***

Data SEGMENT, defining segments

MSG1 DB ' ***welcome to Me program by lluct*** ', ' $ '

To define the first string information for the output, the string must be defined with DB, and $ is the end flag

MSG2 DB ' 1:basic message 2:advanced message ', ' $ '

; Define string information for output: Select Menu

MSG3 DB ' please CHOOSE: ', ' $ '

; Define string information for output: Select prefix

MSG4 DB ' hello,world! ^-^ ', ' $ '

; Define string information for output: information for branch 1

MSG5 DB ' This is my asm_86 program! @^-^@','$'

; Define string information for output: information for branch 2

ErrMsg DB ' CHOOSE error! -_-b ', ' $ '

; Define string information for output: Error message Selection

Data ENDS end of segment

Code SEGMENT, defining snippets

Assume Cs:code; the content of CS

Assume Ds:data; the content of the DS

Start:mov Ax,data; program starting from Start

MOV Ds,ax;D S-Value, section address of data

Call ENTER; invoke show carriage return newline subroutine

LEA DX,MSG1; Output the offset address of the first string

Call Dispchs; invoke display string subroutine

Call ENTER; invoke show carriage return newline subroutine

Call ENTER; Ditto AH-^

LEA dx,msg2; Output the offset address of the second string

Call Dispchs; invoke display string subroutine

Again:call ENTER; define AGAIN label. Used to select the error loop

LEA dx,msg3; Output the offset address of the third string

Call Dispchs; invoke display string subroutine

MOV ah,01h; Call 1th function: Enter a character from the keyboard and Echo

INT 21H; complete input echo

CMP AL, ' 1 '; input characters compared to 1

JE BASICP if equal, transfer to BASICP label (je=jump if Equal)

CMP AL, ' 2 '; input characters and 2-phase comparison | |

JE ADVANP if equal, transferred to ADVANP label (je= if equal to transfer)

JMP error, otherwise unconditionally transferred to the error label

Exit:mov ah,4ch 4C Function call: Terminates the current program and returns the calling program

INT 21H; back to Dos

Basicp:call ENTER; What, also want to explain AH. Halo-_-!!!

LEA dx,msg4; Output the offset address of the third string

Call Dispchs; invoke display string subroutine

Call ENTER; .....

JMP exit, unconditional transfer to exit label

Advanp:call ENTER; 55555555

LEA Dx,msg5, explained four times, should understand

Call Dispchs; invoke display string subroutine

Call ENTER; I'll die for you.

JMP exit, unconditional transfer to exit label

Error:call ENTER

LEA dx,errmsg; Output selection error message

Call Dispchs; invoke display string subroutine

MOV dl,07h; output ASCII alarm (Bell) control character Bel (07H)

Call dispch; calls display a single word subcode program

Call ENTER

JMP AGAIN

DISPCH PROC NEAR

Display a single character subcode program that near the subroutine and the main program in the same Code snippet (now no main program calls)

MOV ah,02h 2nd number function call: Display output characters

INT 21H; finish output display

To return to a RET;

DISPCH ENDP; end of subroutine

Enter PROC NEAR; show carriage return newline subroutine

MOV DL,0DH; return controller CR (0DH) for output ASCII

Call dispch; calls display a single word subcode program

MOV dl,0ah; line break control for output ASCII LF (0AH)

Call dispch; calls display a single word subcode program

To return to a RET;

ENTER ENDP; subroutine end

Dispchs PROC NEAR