Question

• AT&T x64/GNU Assembly syntax only please

Write an assembly language program which either hardcodes or reads in the lengths of the sides of a triangle, and outputs a truthy value (1, “true”, “yes”, and others) indicating whether the triangle is a valid one or not (0, “false”, “no”, etc). A triangle is valid if the sum of each pair of sides is greater than the unpaired side. Meaning if a, b, c are the three sides of a triangle, then the triangle is valid if all three of these conditions are satisfied:

• a + b > c

• a + c > b

• b + c > a

This would invalidate a triangle such as a=3, b=3, c=6, which would only be a line. Use this as a test case, as well as creating your own test cases.

I found a similar question that was answered but I wanted to see if someone else had different insight into this problem. I am still trying to learn assembly.

Answer 1

The Software Used for Writing ALP is MASM-32

Procedure:

1.) Save the program using .asm extension written in q-editor of masm-32 software

2.) Open the command prompt from Q-editor and type the following

set path=c:/masm32/bin

ml/Zi filename.asm

cv filename.exe

3.) Observe the registers by clicking F5 (direct result) or F10(step by step execution)

Program:

.model small

.dosseg

.data

A dw 01H

B dw 02H

C dw 03H

msg1 db 'Valid Triangle','$'

msg2 db 'Not a Valid Triangle','$'

.code

START:

MOV AX, @DATA;

MOV DS, AX; // intialising data segment with data

XOR AX, AX; // clearing accumulator register

XOR BX, BX; // clearing base register

XOR CX, CX; // clearing count register

XOR DX, DX; // clearing data register

MOV AX, A; // move A data into Accumulator register

MOV BX, B; // move B data into Base register

MOV CX, C; // move C data into Count register

ADD AX, BX; // Adding contents of ax,bx and storing in ax

ADD BX, CX; // Adding contents of bx,cx and storing in bx

ADD CX, AX; // Adding contents of cx,ax and storing in cx

CMP AX, C; // comparing content of ax with C (if C is bigger carry occurs)

JNC L1; // if content of ax is greater than C , jump to L1

MOV DX, OFFSET msg2; // moving address of msg2 into dx

MOV AH,09H; // moving 09h to ah

INT 21H; //sending an interrupt to stop execution

HLT; // stop execution

L1: CMP BX, A; // comparing bx with A

JNC L2; // if no carry occurs jump to L2

MOV DX, OFFSET msg2; // move address of msg2 to dx

MOV AH,09H; //move 09h to ax

INT 21H; //interrupt the program

HLT; //stop execution

L2: CMP CX, B; // comparing cx and B

JNC L3; // jump if no carry to L3

MOV DX, OFFSET msg2; // moving address of msg2 to dx

MOV AH,09H; //moving 09h to ah

INT 21H; //interrupt the program

HLT; // stop execution

L3: MOV DX, OFFSET msg1; // moving address of msg1to dx

MOV AH,09H; // moving 09h to ah

INT 21H; // interrupt program

HLT; // stop execution

END START; //end the start

END; // end of program