So I am trying to write a program in MASM x86 (8086) that will printout a series of right triangles built of asterisks “”. I am using loops to print out the triangles. I am trying to make each of the triangles 3 to 9 asterisks high and the same number across, but in different configurations. I got it to only print one triangle though. After my 1st triangle is printed, it just keeps looping asterisks "" indefinitely. Here is some of my code:
mov ah, 09h ;prints string
mov dx, offset input
int 21h
mov ah, 01h ;reads in character
int 21h
sub al, '0' ;is gunna read into lower half by default
mov ah, 0 ;blanking higher half of register so that way it doesnt throw off program
mov size, ax
mov cx, ax
mov bx, cx
push bx
mov ah, 02h
mov dl, 13
int 21h
mov dl, 10
int 21h
lines:
push cx
stars:
mov ah, 02h
mov dl, '*'
int 21h
loop stars
mov ah, 02h
mov dl, 13
int 21h
mov dl, 10
int 21h
pop cx
loop lines
mov bx, size
mov ax, 4c00h
int 21h
Im guessing I have to create another register to hold the variable and possibly create another loop.
My question is, do I have to pass the user input into another register? And if so, how can I pass it?
You've already put the user input in the SIZE variable, so that's fine.
After the 1st triangle is drawn you put this variable back in the CX register, change it a bit (more or less) and repeat the code for the triangle:
; First user defined triangle
mov ah, 02h
mov dl, 13
int 21h
mov dl, 10
int 21h
lines:
push cx
stars:
mov ah, 02h
mov dl, '*'
int 21h
loop stars
mov ah, 02h
mov dl, 13
int 21h
mov dl, 10
int 21h
pop cx
loop lines
; Take back the size and change it a bit
mov cx, size
add cx, 5
; Second bigger triangle
mov ah, 02h
mov dl, 13
int 21h
mov dl, 10
int 21h
lines:
push cx
stars:
mov ah, 02h
mov dl, '*'
int 21h
loop stars
mov ah, 02h
mov dl, 13
int 21h
mov dl, 10
int 21h
pop cx
loop lines