FACTORIAL(FACT, N)

Procedure A: FACTORIAL(FACT, N)

This procedure calculate N! and returns the value in the variable FACT.

1.  If N = 0, then:Set FACT : = 1, and return.

2.  Set FACT : = 1. [Initializes FACT for loo.]

3.  Repeat for K = 1 to N.
        Set FACT : = K*FACT.
[End of loop.]

4.   Return.


Procedure B: FACTORIAL(FACT, N)
This procedure calculate N! and returns the value in the variable FACT.

1.   If N = 0, then:Set FACT : = 1, and return.

2.  Call FACTRIAL(FACT, N-1)

3.    Set FACT : = K*FACT.
4.   Return.

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