hello friends:
I am a student of Assembly language and making some programs to have an insight of this language.. along with i am also supposed to submit a project at the end.
I've made this program, which'll convert tempt from celsius to fehrenheit and vice versa..It's compiled in masm611 and generating no errors..But its not giving the accurate results..I dnt Why..?
Here the code goes..

.model small
.stack 100h
.data
	msg db 0ah, 0dh, 'To convert from Celsius to Fahrenheit, press "f" ' , 0ah, 0dh, 'To convert from Fahrenheit to Celsius, press "c" ', '$'
	msg1 db 0ah, 0dh, 'Temperature in Celcius is: ', 0ah, 0dh, '$'
	msg2 db 0ah, 0dh, 'Temperature in Fahrenheit is: $'
	msg3 db 0ah, 0dh, 'Do you want to do it again: (y/n), $'
	msg4 db 0ah, 0dh, 'Invalid entry! $'
	msg5 db 0ah, 0dh, 'Enter the temp: $'

	tmp db ?
	dvs db ?

	f db ?
	ces db ?
	result db ?

.code
.startup

OUTER:
	LEA dx, msg
	MOV ah, 9
	int 21h

	MOV ah, 1
	int 21h 
	
	CMP al, 'f'
	JE feh

	CMP al, 'c'
	JE cel

	JMP err

CEL: 
	
	lea dx, msg5
	mov ah,9
	int 21h

	CALL indec

	MOV f, al

	SUB f, 32d	;f= f - 32
	
	MOV dvs, 9
	MOV al, 5	;al = dividend
	IDIV dvs	;dvs = divisor
	
	MOV cl, al	;cl=5/9

	MOV al, f
	IMUL cl	

	LEA dx, msg1
	MOV ah, 9 
	int 21h

	xor ah, ah

	MOV ah,2
	mov dl, 0ah
	int 21h
	mov dl, 0dh
	int 21h

	CALL outdec 

	JMP again


;f = c * 9 / 5 + 32 

FEH:
	lea dx, msg5
	mov ah,9
	int 21h

	CALL indec

	MOV ces, al

	MOV dvs, 5
	MOV al, 9
	IDIV dvs

	;MOV tmp, al	;tmp = 9/5

	IMUL ces

	MOV cx, ax	;cx = c*9/5

	ADD cx, 32d

	MOV ax, cx
	
	MOV ah,2
	mov dl, 0ah
	int 21h
	mov dl, 0dh
	int 21h

	CALL outdec

	JMP again
	

ERR:

	LEA dx, msg4
	mov ah, 9
	int 21h

AGAIN:
	LEA dx, msg3
	mov ah, 9
	int 21h

	MOV ah, 1
	int 21h

	CMP al, 'y'
	JE outer

	CMP al, 'Y'
	JE outer

	JMP end1

END1:	
.exit

;Indec proc for decimal input
INDEC PROC
	PUSH bx
	PUSH cx
	PUSH dx
@begin:
	XOR bx, bx
	XOR cx, cx

	MOV ah,1
	int 21h

	CMP al, '-'
	JE @minus

	CMP al, '+'
	JE @plus
	JMP @repeat2

@MINUS:
	MOV cx,1

@PLUS:
	int 21h
	
@repeat2:
	CMP al, '0'
	JNGE @not_digit

	CMP al, '9'
	JNLE @not_digit
	
	AND ax, 000fh
	PUSH ax

	MOV ax, 10
	MUL bx
	POP bx
	
	ADD bx, ax

	MOV ah,1
	int 21h

	CMP al, 0dh
	JNE @repeat2

	MOV ax, bx

	OR cx, cx
	JE @exit

	NEG ax

@EXIT:
	POP dx
	POP cx
	POP bx
	RET

@not_digit:
	MOV ah,2
	MOV dl, 0dh
	int 21h
	
	MOV dl, 0ah
	int 21h
	JMP @begin

INDEC endp

;decimal output, from Ytha Yu's book on assembly
OUTDEC PROC

	PUSH AX
	PUSH BX
	PUSH CX
	PUSH DX
	
	OR AX, AX
	JGE @END_IF1
	
	PUSH AX
	MOV DL, '-'
	MOV AH, 2
	INT 21H
	
	POP AX
	NEG AX
	
@END_IF1:
	XOR CX, CX
	MOV BX, 10D
	
@REPEAT1:
	XOR DX, DX
	DIV BX
	PUSH DX
	INC CX
	
	OR AX, AX
	JNE @REPEAT1
	
	MOV AH, 2
	
@PRINT_LOOP:
	POP DX
	OR DL, 30H
	INT 21H
	LOOP @PRINT_LOOP
	
	POP DX
	POP CX
	POP BX
	POP AX
	
	RET
	
OUTDEC ENDP


end

It usually takes more than 3 hours to get an answer in the Assembly forum.
What sort of output do you get, did you follow the values with a debugger or by printing them to the screen(I'm to lazy to follow/fully read your code)?

I am printing the results on the screen..
It's usually giving a single answer to every fahrenheit or celcius degree..like if I give 212F as input, It's not giving 100as output..rather 525 or 234 something like that..and then every degree conversion is giving that same answer..

This article has been dead for over six months. Start a new discussion instead.