250+ TOP MCQs on Character Class Testing & Conversions and Answers [2024]

C test on “Character Class Testing & Conversions”. One shall practice these test questions to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C test questions come with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of C test questions on “Character Class Testing & Conversions” along with answers, explanations and/or solutions:

1. Which of the following library function is not case-sensitive?
a) toupper()
b) tolower()
c) isdigit()
d) all of the mentioned
Answer: c
Clarification: None.

2. The following C 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
Answer: d
Clarification: None.

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
Answer: d
Clarification: None.

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

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

a) digit
b) not digit
c) Depends on the compiler
d) None of the mentioned
Answer: b
Clarification: None.

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

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

a) digit
b) not digit
c) Depends on the compiler
d) None of the mentioned
Answer: b
Clarification: None.

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

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

a) digit
b) not digit
c) Depends on the compiler
d) None of the mentioned
Answer: a
Clarification: None.

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

```
    #include 
```
```
    #include 
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        if (isspace(i))
```
```
            printf("spacen");
```
```
        else
```
```
            printf("not spacen");
```
```
            return 0;
```
```
    }
```

a) Compile time error
b) space
c) not space
d) None of the mentioned
Answer: c
Clarification: The value of variable i is 0 which is the NULL character in ASCII. Hence, the output will be printed as “not space”.

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

```
    #include 
```
```
    #include 
```
```
    int main()
```
```
    {
```
```
        int i = 32;
```
```
        if (isspace(i))
```
```
            printf("spacen");
```
```
        else
```
```
            printf("not spacen");
```
```
            return 0;
```
```
    }
```

a) Compile time error
b) space
c) not space
d) None of the mentioned
Answer: b
Clarification: The ASCII value of space character is 32. Since the variable i stores 32, the output will be printed as “space”.

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