Which of the following character functions will return a non-zero integer when a space is passed into the function? Check all that apply.

Question

a) ischar

b) isvalid

c) isspace

d) ispunct

e) isprint

f) isalnum

Answer 1

ischar(int) and isvalid(int) - Haven't seen in standard C library

isspace(int) and isspace(int) - Returns TRUE or some positive number

a) ischar - not a standard library function

b) isvalid - not a standard library function

c) isspace - return 0

d) ispunct - return 0

e) isprint - some positive number

f) isalnum - some positive number