THE PROBLEM: Design and write a program in MASM that will prompt the user to enter an integer value. This integer value will be used by the program to print out a series of right triangles built out of asterisks '*'. Each of the triangles will be printed out one at a time using loops. Each of the triangles should also be between three and nine asterisks high, and the same number across, but in different configurations.

Example:

Input : 3

*

* *

* * *

-

* * *

* *

*

-

*

* *

* * *

-

* * *

* *

*.

What I typed.

org 100h

.model small

.stack 64

.data

;Question the user of the input. input db "Enter the size for the triangles, between 3 to 9, or 0 to quit: $"

size dw ?

.code

main proc mov AX, @data ;move location of data segment into AX mov DS, AX ;DS now points to the data segment prompt: mov AH, 09h ;opcode to print a string lea DX, input ;string to print out int 21h mov AH, 01h ;opcode to read in single charcter input int 21h cmp AL, '0' ;checking to see if user input is '0' to start a quit je exit

sub AL, '0' ;convert user into literal value mov AH, 0 ;may not be required, blacks out top half of AX mov size, AX ;copy of literal vaue into variable size mov CX, AX ;copy value in AX into the count (CX) register ;cx count down mov BX, 1 ;set up BX for star counter loop. call crlf ;call crlf proc for carriage return / new line ;First Triangle lines1: push CX ;store the out (lines) loop mov CX, BX ;the start to print out also moves it stars1: mov AH, 02h ;opcode to print a single charater mov DL, '*' ;charater to print out int 21h loop stars1 ;end stars loop call crlf inc BX ;increment BX for stars loop pop CX ;recover CX for outer lines loop loop lines1 ;call crlf proc call crlf ;call crlf proc for carriage return / new line mov CX, size mov BX, 1 ;reload CX with the size copy for next triangle ;Second Triangle lines2: push CX ;stroe the outer (lines) loop value stars2: mov AH, 02h ;opcode to print a single charater mov DL, '*' ;charater to print out int 21h loop stars2 ;end stars2 loop call crlf ;call crlf proc pop CX ;recover value for outer loop loop lines2 ;end lines loop call crlf ;call crlf proc mov CX, size ;reload CX with copy of size for next triangl mov BX, 1 ;set up BX for star loop ;Third Triangle lines3: push CX ;push copy of CX onto stack for lines loop mov CX, BX ;the number of spaces to print out spaces1: mov AH, 02h ;opcode to print single character mov DL, ' ' ;blank space to print out int 21h loop spaces1 ;end spaces loop pop CX ;recover value into CX for stars loop push CX ;push CX for outer lines loop stars3: mov AH, 02h ;opcode to print a single charater mov DL, '*' ;charater to print out int 21h loop stars3 ;end stars_3 loop call crlf ;call crlf proc inc BX ;add one to BX for next line pop CX ;recover CX four outler lines loop loop lines3 call crlf ;call crlf proc mov CX, size mov BX, 1 ;set up CX with copy of size for next triangl ;Four Triangle lines4: push CX spaces2: mov AH, 02h ;opcode to print single character mov DL, ' ' ;blank space to print out int 21h loop spaces2 ;end spaces loop pop CX ;recover valut into CX for stars loop push CX stars4: mov AH, 02h ;opcode to print a single charater mov DL, '*' ;charater to print out int 21h loop stars4 ;end stars_3 loop call crlf ;call crlf proc pop CX ;recover CX four outler lines loop loop lines4 call crlf exit: mov AX, 4C00h ;opcode to terminate program int 21h main endp

crlf proc mov AH, 02h mov DL, 13 int 21h mov DL, 10 int 21h ret

crlf endp end main

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The resolute I get is.

*

**

***

***

**

*

***

**

*

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**

*