The expression being tested by the statement shown below will evaluate to true if var1 is __________. if (!isdigit(var1))
A) an alphabetic character
B) 9
C) a symbol such as $ or &
D) both A and C
E) None of these

Question

Quizplus · Accepted Answer

The isdigit() function checks whether a character is a digit or not. The logical NOT operator (!) is used to reverse the result of the isdigit() function. Hence, the expression will evaluate to true if var1 is not a digit, which means it can be an alphabetic character or a symbol such as $ or &. Therefore, the correct answer is D.

The Expression Being Tested by the Statement Shown Below Will