Factorial Calculator with Exponentiation Lab# 3

LAB DESCRIPTION:

For laboratory three students were encouraged to use labels, compare, and jump statements [commands]. The coder–student–must create a hla enveloped program that displays a menu upon start-up with the following options (1) The sum of a number, (2) The product of a number, (3) The number 2 raised to a number of the users choice [“n”]. (1) Is defined as the factorial, for a positive number n the program will make n! = n+(n-1)+((n-1)-1)+…..+1, note that the factorial of 0 is equal to 1. Please go to this website for information on why 0!=1 http://mathworld.wolfram.com/Zero.html

In addition (2) is defined as n*! = n*(n-1)*((n-1)-1)*(n-3)*………*1.

CODE:

program FactLab3;
#include ("stdlib.hhf");

static
a : int32;
b : int32;
c : int32;
Application :  int32;

begin FactLab3;
Start:

stdout.put("Hello This is Rafael AND Cynthia's second calculator. :)");

stdout.put("The following opperations are available.", nl, "(1)The sum of a number[factorial]",nl, "(2)The product of a number[factorial miltiplication ]",nl , "(3)The exponetial of 2^(number)",nl ,"(4)And final an exit to the program",nl );
stdout.put("Reminder: For Application (1),(2),(3) you may not use a negative number!", nl);

stdout.put("Please select from the above list.",nl"Application",nl);
stdin.get(Application);

	  cmp(Application,4);//checks if out side available choices
	JG Start;//Sends back to Start Label at the begining
	  cmp(Application,1);//checks if out side available choices
	JL Start;//Sends back to Start Label at the begining

	cmp(Application,1);//checks if FactorialStart Label was selected
	 JE FactorialStart;

	cmp(Application,2);//checks if FactorialMul Label was selected
	 JE FactorialMul;

	cmp(Application,3);//checks if n2Exp Label was selected
	 JE n2Exp;

	cmp(Application,4);//checks if Last Label was selected, this ends the program
	 JE Last;

FactorialStart://jumps to this part when Applications is equal to 1.
   stdout.put("You may not enter a number above or equal to 65000 or 2 raised to the 16 exponential value!",nl, "Please enter the number to   be used.",nl);
    stdin.get(a);
    cmp(a,0);		//checks for special case 0! = 1 sends to output loop
    JE FactorialSpecial;
    cmp(a,0);		//checks for negative numbers a=1,4>=1,3>=1,2>=1,1>=1...
    mov(edx,ecx);  // 5+0,5+5,5+10,5+15....20+20+20....60+60...120+0...
   cmp(eax,1);
*/
   add(edx,c);// was add(eax,c);....infinite loop when i tried to save back to eax after full loops
   sub(1,b);
   mov(c,ecx);
   mov(ecx,a);
//stdout.put("The first loop value is  ", "c ", c, "    a ", a , nl, nl);
//just outputted values to check the loop to make sure the answer was right at each loop
   cmp(b,1);// used for loops 4 loops then 3 then 2 then 1
JGE FactorialMulLoop;// sends back to first loop for repeated addition
JNGE FactorialMulLoop2;//sends to second loop

FactorialMulLoop2:// second loop decides the multiplication
/*
//n = n*(n-1)*n-2...*1
sub(1,b);
cmp(b,1);
*/
     sub(1,eax);
     mov(eax,b);
     mov(c,edx);//mov(c,eax)gave...infinite loop when attempted to save value.
     mov(0,c);
//stdout.put("The second loop value is  ", "c ", c, "    a ", a , nl, nl); 
		//used to check the loop values
    cmp(eax,1);// used to compare for loops, 4 loops then 3 then 2 then 1
 JGE FactorialMulLoop;// sends back to the first loop with degraded value for its loop
 JNGE Output2;// sends to output once all the loops for the first and second are completed

Output2:
    mov(ecx,c);

    stdout.put("The factorial product is ", c,nl,nl,nl); 
     mov(0,eax);
     mov(0,ebx);	//Resets registers for next operation
     mov(0,ecx);
     mov(0,edx);
 jmp Start;	// sends to begging of program for an other selection

n2Exp:
    stdout.put("Please enter the exponent value to raise the number two to the ",nl);
    stdin.get(a);
    cmp(a,0);	// set a case for 2^0 sends to output imediately
 JE n2ExpSpecial;
    cmp(a,1);	// set a case for 2^1 sends to output imediately
 JE n2ExpSpecial1;
    cmp(a,65000);	// checks to see if number is greater than 65000
 JGE FactorialREStart2;
 JNGE n2ExpStart;
 // 2 raised to the 16 is fine for entry here only because the entry is 16 and not 65536.

FactorialREStart2:
   stdout.put("This number is not in the span available please choose an other value");
   stdout.put("Please enter the number to be used.",nl );
   stdin.get(a);
   cmp(a,65000);
 JGE FactorialREStart2;
 JNGE n2ExpStart;

n2ExpSpecial:
    stdout.put("The exponential of 2^[0]= 1",nl,nl);
 jmp Start;
n2ExpSpecial1:
    stdout.put("The exponential of 2^[1] = 2",nl,nl);

n2ExpStart:
   mov(2,c);	// sets 2 as the incrimenter
   mov(0,ebx);// moves 0 to register ebx for starting value
 jmp n2ExpLoop;	// sends to main addition loop bellow

n2ExpLoop:
  add(c,ebx);//2+0 for start point 2^2
  mov(ebx,c);	// saves the value for powers of 2
  sub(1,a);	// sub 1 from a until a is 1
  cmp(a,1);	//checks against 2^1 for value of the exponent
 JGE n2ExpLoop;	
 JNGE n2ExpOutput;	//sends to output once loop is completed

n2ExpOutput:
	mov(ebx, b);// moves ebx to b for outputting
	stdout.put("The Exponential value of 2 =", b, nl,nl); 
	mov(0,eax);
	mov(0,ebx);	//Resets registers for next opperation
	mov(0,ecx);
	mov(0,edx);
	jmp Start;	// sends to beggining of program for an other selection
Last:
end FactLab3;

Screen Shots:

I am not certain why but for the factorial once entered i received a value of 134512807 for any number at the first start of the program, but after attempting the run again I out put the correct answer while still running the same code that gave me 134512807.