Assembly language-finding the factorial of X

1. title: Finding the factorial value of X

2. requirements: input An integer number (not more than 10), to find its factorial value after the output, the factorial algorithm is implemented with Subroutines.

3. Hint: can be implemented by recursive return, can also be implemented with a simple loop.

This is accomplished by using loops:

For the novice assembly, it is best to test the programming in a high-level language and then write the assembly code so that the effect is better,

The C + + code to find factorial is as follows:

1//the program was to find the factorial from 1 to 2//author:karllen 3//date:  05/21/2014 4  5 #include <ios Tream> 6  7 int factorial (int n); 8  9 int main () {one     int n;12     std::cin>>n;13     std::cout <<factorial (n) <<std::endl;14     system ("pause"),     return 0;17}18 int factorial (int n) 20 {21     int sum = 1;22 while     (n!=1) @     {         sum*=n;25         --n;26     }27     return sum;28}

The assembly code is as Follows:

 1; Example assembly language program--adds, numbers 2; Author:karllen 3; date:revised 05/2014 4 5.386 6. MODEL FLAT 7 8 exitprocess PROTO NEAR32 stdcall, dwexitcode:dword 9 INCLUDE io.h; Header file for INPUT/OUTPUT11-CR EQU 0dh; Carriage return character13 Lf EQU 0ah; Line FEED14 15. STACK 4096; Reserve 4096-byte Stack16 17. DATA; Reserve storage for Data18 prompt BYTE "the program was to find the factorial from 1 to ten", cr,lf,019 num    Input byte "please Enter a number from 1 to ten", cr,lf,020 answer byte "the number factorial is" BYTE-by-one DUP (?) BYTE cr,lf,023 public _start 25. CODE _start:27;            Start of main program code28 output prompt doinput:31 output numInput32   Input value,1133 atod value34 CMP eax,135 JL doInput36 CMP eax,1037 JG doInput38 push eax39 C         All findFactorial40 add esp,441 dtoa value,eax43 output Answer 44 45 INVOKE exitprocess, 0; Exit with return code 046; Make entry point public47 findfactorial PROC NEAR3249 push EBP50 mov ebp , ESP51 mov eax,[ebp+8]53 mov ebx,eax54 cmp E                            ax,155 JE endfindwhile dofindwhile:57 Dec ebx58                            CMP ebx,159 JE endFindWhile60 mul ebx61                   jmp doFindWhile62 endfindwhile:63 Pop Ebp64                       Ret65 findfactorial ENDP66 END      ; End of source code

Test Results:

Assembly language-finding the factorial of X