programb45 - Microprocessors Applications(UPTU Explanation...

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Microprocessors & Applications (UPTU) Appendix B  Explanation : To compute the factorial of a number means to multiply the number n with (n – 1) (n – 2) …. × 2 × 1. e.g. to compute 5 ! 5! = 5 × 4 × 3 × 2 × 1 = 120. In our program, we will initialize AX = 1 and load the number whose factorial is to be computed in BX. Call recursive procedure fact, which will calculate the factorial of the number. Display the result.  Algorithm : Step I : Initialize the data segment. Step II : Initialize AX = 1. Step III : Load the number in BX. Step IV : Call procedure fact. Step V : Compare BX with 1, if not goto step 7. Step VI : AX = 1 and return back to calling program. Step VII : Fact = AX × BX. Step VIII : Decrement BX. Step IX : Compare BX with 1, if not goto step 7. Step X : Return back to calling program. Step XI : Display the result. Step XII : Stop.  Flowchart : Refer flowchart 45.  Program : .model small .data num dw 08h .code mov ax, @data ; initalize data segment mov ds, ax mov ax, 01 ; initalize ax=1 mov bx, num ; load the number in cx
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