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Question: Never understood th eproc() without parameters

Question:Never understood th eproc() without parameters

janhardo 335 Maple
procedure
August 09 2020
0

Study a example 

Procedures. Declare local variables within procedures.
> # Program 1: Procedures.
> # The norm of a 3-dimensional vector.
> norm3d:=proc() local a,b,c;sqrt(aˆ2+bˆ2+cˆ2) end;
> norm3d(3,4,5);
5√(2)

Must say it was never clear for me the procedure () 
Never have read in the tutorials or study material the use of proc ( )  ( i did not read them all, so probably i missed it somewhere )

The procedure norm3d()  i get not working , because i don't not know how to use it 

 
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