Character Class Testing & Conversions - C Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Character Class Testing & Conversions – 1”.

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

1. Which of the following library function is not case-sensitive?
a) toupper()
b) tolower()
c) isdigit()
d) all of the mentioned
View Answer

Answer: c
Explanation: None.

2. The following C expression can be substituted for?

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 if (isalpha(c) && isdigit(c))

a) if (isalnum(c))
b) if (isalphanum(c))
c) if (isalphanumeric(c))
d) none of the mentioned
View Answer

Answer: d
Explanation: None.

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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
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <ctype.h>
```
```
    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
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <ctype.h>
```
```
    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
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    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
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <ctype.h>
```
```
    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
View Answer

Answer: c
Explanation: 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 <stdio.h>
```
```
    #include <ctype.h>
```
```
    int main()
```
```
    {
```
```
        int i = 32;
```
```
        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
View Answer

Answer: b
Explanation: 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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C Programming Questions and Answers – Character Class Testing & Conversions – 1

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