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- 12th April 2008, 07:01 #1

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## C++ programs for calculating factorial and fibonacci series using stack

can any body give me the following codes ill be really thankful:

1. Write a C++ program to calculate FACTORIAL of a number using STACK.

2. Write a C++ program to generate a FIBONACCI series using STACK. Number of Fibonacci series is input by the user.

- 12th April 2008, 07:01

- 13th April 2008, 01:55 #2

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## Re: i need help........

Code:// This program illustrates the use of inline assembly from within C++. // N - factorial is calculated using a "stack frame" to pass the parameters // and recursion to find the number. // // Written by Joe Toone March 11, 2005 // Modified to work with Visual Studio.Net 2005 November 6, 2007 #include <iostream> //changed iostream.h to iostream to meet VS .Net requirement using namespace std; //needed for VS 2005 .Net int factorial(int n); void main() { int number,nfact; while(1) { cout << endl << "Enter the number to find the factorial of (0 to exit) -> "; cin >> number; if (number<=0) break; nfact=factorial(number); cout << "n factorial of " << number <<" is " << nfact << endl; }; }; //end of main /* This function is presented for informational purposes only however, you could uncomment this function and comment out the assembly version of the function and it would work. // A typical C++ function to calculate the factorial of n // Notice that recursion is used to find the factorial int factorial(int n) { if(n==1) return(1); else n = factorial(n-1) * n; }; */ // The following function uses inline assembly code to calculate the factorial // of n. Notice that it has a standard C++ function header. Inside the C++ // function, you should notice the "__asm" statement which signals that the // following statements are normal x86 assembly instructions. // N - factorial is calculated by recursive calls to the assemble procedure // "factor". The answer is left in the EAX register and is returned to the // calling C++ function from that location. // It should also be noted that each recursive call produces a new "stack frame" // on which the parameters are passed. It is critical that the "stack" be // managed properly, since it is the same stack that the C++ program is using // to pass it's parameters. // More information on using inline assembly may be found in the MSDN library. int factorial(int n) //Normal C++ function header with parameter { __asm { ;C/C++ reserved word or inline assembly mov ecx,n ;copy C++ parameter to ECX register push ecx ;push parameter onto the stack call factor ;call the local factorial procedure jmp outtahere ;we have an answer, so jump to exit factor: ;We are forced to use the simplest form of ;an assembly procedure since inline code does ;not support the PROC assembler directive. push ebp ;Establish the "stack frame" mov ebp,esp ; push ecx ;place a copy of "n" on the stack ;if n = 1 ;if "n" is not equal to 1 cmp dword ptr [ebp+8],1 ; "n" is located on the stack jne else01 ; jump to the else condition mov eax,1 ; otherwise n==1, so set EAX to 1 jmp endif01 ; and exit the if else01: ; mov ecx,dword ptr [ebp+8] ;else retrieve n from stack dec ecx ; decrement n push ecx ; place n back on the stack call factor ; and call factor again add esp, 4 ;reduce the stack pointer by one dword mul dword ptr [ebp+8] ;multiply EAX by n push ecx ;place n parameter back on the stack endif01: ;end of if statement pop ecx ;remove left over paramter from the stack pop ebp ;restore the original base pointer ret 4 ;discard the original value of n outtahere: ;the answer is in EAX register mov n,eax ; so copy it to the C++ parameter }; //end of inline assembly code return n; //return the answer to C++ caller }; //end of factorial

2.

http://en.wikibooks.org/wiki/Transwi...number_program

http://cubbi.com/fibonacci/c++.html#f2b

- 13th April 2008, 01:55

- 13th April 2008, 08:54 #3

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## Re: i need help........

thank you so much for your help .

Actually i need a code which is written using simple stack the 1st code you gave me is written using recursion and the other 1 is too difficult for me to understand and the fibonacci series ,mentioned in those webs, is also in recursion form so if you plz give me these codes again using simple stack it'll be really nice of you .

- 13th April 2008, 08:54

- 13th April 2008, 10:01 #4

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## Re: i need help........

http://www-mdp.eng.cam.ac.uk/CD/enga...functions.html

http://nz.answers.yahoo.com/question...6124418AAU2QJ3

http://www.codecodex.com/wiki/index....al_of_a_number

Code:# include < iostream.h> # include < conio.h> void fact(int); void main() { clrscr(); int n; cout < < "Enter limit : "; cin>>n; fact(n); getch(); } void fact(int x) { char a; int i=1; for(int j=1;j< =x;j++) { i*=j; } cout< < "Answer = "< < i< < endl; cout< < "Want to continue ( y )/or press any key to continue "; cin>>a; if(a=='y') { main(); } else { cout< < "Good Bye "; } getch(); }

Code:int factorial(int n) { int fact=1; /* error check */ if (n<0) return 0; /* multiply n by all numbers smaller than n and greater than 0 */ for( ; n>0; n--) fact *= n; /* return the result */ return(fact); }

- 30th April 2008, 05:46 #5

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## i need help........

You don't need a stack for these operations. Recursion is perfect for both

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