C Programming – String Operations

C Programming - Character Class Testing & Conversions

Question 1

Which of the following library function is not case-sensitive?

A	toupper()
B	tolower()
C	isdigit()
D	All of the mentioned

Question 2

 The following expression can be substituted for.     if (isalpha(c) && isdigit(c))

A	if (isalnum(c))
B	if (isalphanum(c))
C	if (isalphanumeric(c))
D	None of the mentioned

Question 3

 Which of the following will return a non-zero value when checked with isspace(c)?

A	blank
B	newline
C	return
D	All of the mentioned

Question 4

What is the output of this C code?

    #include 
    #include 
    int main()
    {
    char i = 9;
    if (isdigit(i))
    printf("digit\n");
    else
    printf("not digit\n");
    return 0;
    }

A	digit
B	not digit
C	Depends on the compiler
D	None of the mentioned

Question 5

What is the output of this C code?

    #include 
    #include 
    int main()
    {
    int i = 9;
    if (isdigit(i))
    printf("digit\n");
    else
    printf("not digit\n");
    return 0;
    }

A	digit
B	not digit
C	Depends on the compiler
D	None of the mentioned

Question 6

What is the output of this C code?

    #include 
    int main()
    {
    char i = '9';
    if (isdigit(i))
    printf("digit\n");
    else
    printf("not digit\n");
    return 0;
    }

A	digit
B	not digit
C	Depends on the compiler
D	None of the mentioned

Question 7

What is the output of this C code?

    #include 
    #include 
    int main()
    {
    if (isspace('n'))
    printf("space\n");
    else
    printf("not space\n");
    return 0;
    }

A	Compile time error
B	space
C	not space
D	None of the mentioned

Question 8

What is the output of this C code?

    #include 
    #include 
    int main()
    {
    int i = 0;
    if (isspace(i))
    printf("space\n");
    else
    printf("not space\n");
    return 0;
    }

A	Compile time error
B	space
C	not space
D	None of the mentioned

Question 9

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 a & b
D	None of the mentioned

Question 10

 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 a & b
D	None of the mentioned

Question 11

What is the output of this C code?

    #include 
    #include 
    int main()
    {
    char c = 't';
    printf("%d\n", isspace(c));
    }

A	Non-zero number
B	Nothing
C	Error
D	t

Question 12

What is the output of this C code?

    #include 
    #include 
    int main()
    {
    char c = 't';
    printf("is :%c\n", tolower('A'));
    }

A	A
B	a
C	Non-zero number
D	Zero

Question 13

 Which types of input are accepted in toupper(c)?

A	char
B	char *
C	float
D	Both (a) and (b)

Question 14

 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

Check Your Answers:

  1. C

  2. D

  3. D

  4. B

  5. B

  6. A

  7. B

  8. C

  9. C

10. C

11. A

12. B

13. A

14. C

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