In article PAA08417@erawan.cognex.com, Michael R Cook <mcook@cognex.com>
writes:
>Is this a valid ("well-formed") program?
>
>int main()
>{
>    return strlen("Hello, world.\n") != 0;
>}
>
>The point is that the program doesn't have a declaration for the function
>`strlen'.
>
>(I believe the code is invalid, but `gcc -Wall -ansi -pedantic' quietly
>accepts it.)

The program is invalid C++, because you cannot call a function unless
a prototype for it is in scope.

The program is valid C, because prototypes are optional, and the
standard library function strlen is called in a way that matches
its definition. Maybe you compiled the program as C instead of C++.
---
Steve Clamage, stephen.clamage@eng.sun.com
---
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