Answer

1. The first line contains the keyword ``FUNCTION'' instead of ``PROGRAM.'' A program can contain any number of function definitions, but it must contain exactly one main program.

2. The type of the value returned by the function is indicated on the first line. This is not necessary in a main program, which does not return values.

3. The names of the parameters are indicated in parentheses in the first line, and their types are given a few lines further down. This is not necessary in a main program, which does not take parameters.

4. A variable with the same name and type as the function can be assigned a value in the body of the function.

5. The keyword ``RETURN'' is used in place of ``STOP''. We do not want a program to stop execution when a function is finished; instead, we want the value computed by the function to be returned to the caller.

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