use of if (!cptr) and if (cptr) && a programming error

[Doug Gwyn]

In article <10592 at riks.csl.sony.JUNET> diamond at riks. (Norman Diamond) writes:
>But!  What about the following famous idiom!
>    while ((ch = getchar()) != EOF) { ... }
>The old value of ch might be compared to EOF?

No -- however, EOF may be evaluated before ch is set to what getchar()
returns (before the comparison of the new value of ch against EOF).