C Programming Questions and Answers – Character Class Testing & Conversions – 2

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This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Character Class Testing & Conversions – 2”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

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1. Which is true about isaplpha(c), where c is an int that can be represented as an unsigned?

char or EOF.isalpha(c) returns

a) Non-zero if c is alphabetic
b) 0 if c is not alphabetic
c) Both Non-zero if c is alphabetic & 0 if c is not alphabetic
d) None of the mentioned
View Answer

Answer: c
Explanation: None.
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2. Which is true about isupper(c), where c is an int that can be represented as an unsigned?

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char or EOF.isupper(c) returns

a) Non-zero if c is upper case
b) 0 if c is not upper case
c) Nothing
d) Both Non-zero if c is upper case & 0 if c is not upper case
View Answer

Answer: d
Explanation: None.
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3. Which is true about isalnum(c), where c is an int that can be represented as an unsigned?

 char or EOF.isalnum(c) returns

a) Non-zero if isalpha(c) or isdigit(c)
b) 0 if not isalpha(c) or not isdigit(c)
c) Both Non-zero if isalpha(c) or isdigit(c) & 0 if not isalpha(c) or not isdigit(c)
d) None of the mentioned
View Answer

Answer: c
Explanation: None.
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4. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     #include <ctype.h>
  3.     int main()
  4.     {
  5.         char c = 't';
  6.         printf("%d\n", isspace(c));
  7.     }

a) Non-zero number
b) Nothing
c) Error
d) t
View Answer

Answer: a
Explanation: None.

5. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     #include <ctype.h>
  3.     int main()
  4.     {
  5.         char c = 't';
  6.         printf("is :%c\n", tolower('A'));
  7.     }

a) A
b) a
c) Non-zero number
d) Zero
View Answer

Answer: b
Explanation: None.

6. Which types of input are accepted in toupper(c)?
a) char
b) char *
c) float
d) Both char and char *
View Answer

Answer: a
Explanation: None.

7. What is the difference in the ASCII value of capital and non-capital of the same letter is?
a) 1
b) 16
c) 32
d) Depends with compiler
View Answer

Answer: c
Explanation: None.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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