Question

PEP8 Expert Help on Translation

Asked by: Rookie101

Are there experts on PEP8 assmbly language here?   I am stuck.  I believe I have gone as far as I can on the problem.  I'm translating a C++ program to pep 8 Assembly language.  

Where am I going wrong on my code??  I think I'm going wrong on my call statement?

All the help is greatly appreciated!!!   

#include <iostream>
using namespace std;
int fib(int num)
{
      if (num < 1) /*if number is less than or equal to 1*/
      {
		return 1; /* return number */
      }
		else 
      {
		return 2*(fib(num-1))+fib(num-2); /* return fibonacci formula */
      }
}
 
void main()
 
{
            int num;    /* The fibonacci number selected */
            cout << "Which Fibonacci number?  ";
            cin >> num; /* input */
		cout<<"The number is:  " << fib(num) << endl; /*outputs the fibonacci sum*/
}
 
BR    main      
 
num:     .EQUATE 0           ;formal paramter #2,d
 
;
;*****************************main()
main:    STRO  msg1,d      ;cout<<"Which Fibonacci Number?  "
         DECI  num,d       ;cin >> num 
         CHARO '\n',i   ; << endl
         
         STRO  msg2,d      ;cout<< "The number is: "           
         ;STA -2,s
         ;SUBSP 2,i 
         CALL  fib
 
;
;******************** int fib (int num)
num:   .EQUATE 0             ;formal paramter #2h
   
fib:     SUBSP 2,i           ;allocate #num 
if:      LDA  num,d          ;if (num < 1)      
         BRLE else           
then:    LDA  1,i            ; return 1
         STA retVal,s
         RET2
         
else:    ASLA                ; 2* 
         
         LDA  num,d         
         SUBA 1,i            ;(num-1)
         STA num,d
         
         ADDA num,d          ; +
 
         LDA num,d
         SUBA 2,i            ;(num-2)
         STA num,d 
         
         RET2                ;deallocate #num, pop retAdd
 
         BR endIf        
  
                
         endIf:   STOP
                 
 
msg1:    .ASCII  "Which Fibonacci Number? \x00"
msg2:    .ASCII  "The number is:  \x00"
.END

                                  
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Asked On
2009-10-29 at 06:22:57ID24854460
Tags

Machine Language Pep 8

Topic

Assembly Programming Language

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: Infinity08Posted on 2009-10-29 at 06:43:01ID: 25693536

>> Where am I going wrong on my code??  I think I'm going wrong on my call statement?

What is it that is going wrong ? Could you describe that in as much detail as possible ?

 

by: Rookie101Posted on 2009-10-29 at 08:04:31ID: 25694458

Hello again  Infinity08.

I'm not getting any error, it assembles and loads but is not returning any value.  I've even tried to comment out all except the beginning portion where only if (num <1) return 1; is showing.  

 I'm afraid I've been looking at it for so long I'm at a stale mate.   If I can get some value to return, I think I can figure it out on my own.  


 

 

by: Infinity08Posted on 2009-10-30 at 06:56:10ID: 25702954

You seem to be calling FIB, but then you don't do anything after that. You should probably display the returned value or something, and then properly end main.

20120131-EE-VQP-002

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