program star triangle with assembly...?

[fuyulight]

how program to display this triangle??? >_<

> *****
> ****
> ***
> **
> *
>      *
>     **
>    ***
>   ****
>  *****

(just the triangle..)

[Assembly Guy]

We don't do your homework for you. Show some effort of your own toward solving the problem before simply demanding code.

[fuyulight]

.model small
.code
org 100h

start:
     mov cx, 5

L1:
    push cx

L2:
    mov ah,2h
    mov dl,2Ah
    int 21h
    loop L2
    mov dl,0Ah
    int 21h
    mov dl,0Dh
    int 21h
    pop cx
    loop L1
    mov cx,5

L3:
    push cx

L4:
    mov ah,2h
    mov dl,20h
    int 21h 
    loop L4


    mov dl,2Ah
    int 21h

    mov dl,0Ah
    int 21h
    mov dl,0Dh
    int 21h
    pop cx

    loop L3

exit: int 20h
end start

I just can do this... (> <) to display
to display the triangle below, I still can not....

[Assembly Guy]

There's a flaw in your second loop. You're printing the right amount of spaces, but you're only printing one *, hence you don't end up with this:

>      *
>     **
>    ***
>   ****
>  *****

To achieve the above, you need to introduce a counter much like you did in your first loop so that after you've printed the spaces, you print 1 * for the first line of the above pattern, 2 for the next and so on.

It's a bit difficult for me to put into words clearly, but I hope it's helped somewhat.

[untio]

Hi,
Can you give a test to this code:

.286
.model small

.stack 1024h
.code

start:
    mov cx, 5
first:
    mov bl, 2ah
    mov bh, 1
    call    drawall
    loop    first

    mov dx, 5
second:
    mov bl, 20h
    mov bh, 0
    mov cx, dx
    call    drawall
    mov cx, 6
    sub cx, dx
    mov bl, 2ah
    mov bh, 1
    call    drawall
    dec dx
    jnz second
    mov ax, 4c00h
    int 21h


drawall:
    push    ax
    push    bx
    push    cx
    push    dx
drawone:
    mov     ah,2h
    mov     dl,bl
    int     21h
    loop    drawone
    or  bh, bh
    jz  retorn
    mov     dl,0Ah
    int     21h
    mov dl,0Dh
    int 21h
retorn:
    pop dx
    pop cx
    pop bx
    pop ax
    ret

    end start

Please, forgive me if I am wrong.

Cheers.

[Üzåír]

.MODEL SMALL
.STACK  50H
.DATA
    NL  DB  0DH, 0AH, '$'         ; NL = NEXT LINE
.CODE
MAIN PROC
    MOV AX, @DATA
    MOV DS, AX

    MOV CX, 5
    MOV BX, 1

    FOR_1:
        PUSH    CX
        MOV DL, 20H    ; 20H IS ASCII CODE FOR SPACE
        MOV AH, 2

        FOR_2:
            INT 21H    ; PRINTING SPACES
        LOOP    FOR_2

        MOV CX, BX
        MOV DL, '*'
        MOV AH, 2

        FOR_3:
            INT     21H    ; PRINTING STARS
        LOOP    FOR_3

        LEA DX, NL
        MOV AH, 9
        INT     21H    ; MOVE CURSOR TO THE START OF NEXT LINE
        INC BX
        POP CX

    LOOP    FOR_1

    MOV AH, 4CH
    INT         21H
MAIN ENDP
    END MAIN