Question: error in procedure

i'm writing this program and for some reasons i got this error, here is my code

maplet_error.mw

 

evaluating `"myadd(1)"` produces the error: invalid input: myadd uses a 2nd argument, n, which is missing.

the second question is that my procedure only calculate any integer number from 0 to 9 , is there anyway to get this procedure

to calculate bigger numbers and decimal numbers. Thanks in advance.

 

 

 

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