loops - How to draw a square with dimensions given by the user in Assembly language? -


i have far, think problem in code lies in how screen clears? also, if use "mov ah, 7 & int 21h" getch(), work if variables compare them byte-sized, while "mov ah, 0 & int 16h" works when variables word-sized?

.model tiny .code org 100h      project: call clearscreen mov ah, 0 int 16h mov xlimit, ax  ; number of "rows" mov ah, 0 int 16h mov ylimit, ax  ; number of "columns" call border int 20h  clearscreen: mov ah, 7 mov al, 25 mov ch, 0 mov cl, 0 mov dh, 24 mov dl, 79 int 10h mov ah, 2 mov bh, 0 mov dh, 0 mov dl, 0 int 10h ret ; ---------------------------------------------------- border:     mov dh, 0     mov dl, 0     mov ah, 2     int 10h     mov dl, 95     int 21h     mov cx, xlimit   bucle:     mov dl, cl     mov dh,0     int 10h     mov dl, 95     int 21h     mov dx, ylimit     mov dh, dl     mov dl, cl     int 10h     mov dl, 95     int 21h loop bucle     mov cx, ylimit     xor dh, dh  bucle2:     mov dl, 0     mov dh, cl     int 10h     mov dl, 95     int 21h     mov dx, xlimit     mov dh, cl     int 10h     mov dl, 95     int 21h loop bucle2 ret  ; --------------------------------------------------- ; global variables  ylimit dw ? xlimit dw ? end project 

mov ah, 0 int 16h mov xlimit, ax  ; number of "rows"

this code waits until key pressed , gives ascii in al , scancode in ah. meaningful number have convert number.
if p.e. type character "1" "9" convert subtracting 48 al , storing in xlimit. continu using limits word clear ah before storing xlimit.

mov ah, 0 int 16h sub al, 48 cbw mov xlimit, ax  ; number of "rows"

this comment should read number of columns

bonus: clearscreen routine needs parameter before calling bios.

clearscreen: mov ah, 7 mov al, 25 mov bh, 07h  ;attribute blanked area, whiteonblack mov ch, 0 mov cl, 0 mov dh, 24 mov dl, 79 int 10h mov ah, 2 mov bh, 0 mov dh, 0 mov dl, 0 int 10h ret

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