Question

[ace799]

This is just a practice test I found online to prepare for a class that starts on the 27th. Most of the questions I can find on google but this one has stumped me.


The expression !isdigit(ch) evaluates to nonzero if ch is ________.

A) an alphabetic character

B) 9

C) &

D) both A and C

E) None of the above

[ace799]

nvm figured it out.

[Zhuge]

Do you know what isdigit() does with its argument? And what it returns?