250+ TOP MCQs on Basics of Structures and Answers [2024]

C helps anyone preparing for Juniper Networks and other companies C interviews. One should practice these Objective Questions and answers continuously for 2-3 months to clear Juniper interviews on C Programming language.

Here is a listing of C multiple choice questions on “Basics of Structures” along with answers, explanations and/or solutions:

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

```
    #include 
```
```
    void main()
```
```
    {
```
```
        struct student
```
```
        {
```
```
            int no;
```
```
            char name[20];
```
```
        };
```
```
        struct student s;
```
```
        no = 8;
```
```
        printf("%d", no);
```
```
    }
```

a) Nothing
b) Compile time error
c) Junk
d) 8
Answer: b
Clarification: None.

2. How many bytes in memory taken by the following C structure?

```
    #include 
```
```
    struct test
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
    };
```

a) Multiple of integer size
b) integer size+character size
c) Depends on the platform
d) Multiple of word size
Answer: a
Clarification: None.

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

```
    #include 
```
```
    struct
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p;
```
```
        p.k = 10;
```
```
        printf("%dn", p.k);
```
```
    }
```

a) Compile time error
b) 10
c) Undefined behaviour
d) Segmentation fault
Answer: a
Clarification: None.

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

```
    #include 
```
```
    struct
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
    } p;
```
```
    int p = 10;
```
```
    int main()
```
```
    {
```
```
        p.k = 10;
```
```
        printf("%d %dn", p.k, p);
```
```
    }
```

a) Compile time error
b) 10 10
c) Depends on the standard
d) Depends on the compiler
Answer: a
Clarification: None.

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

```
    #include 
```
```
    struct p
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
    };
```
```
    int p = 10;
```
```
    int main()
```
```
    {
```
```
        struct p x;
```
```
        x.k = 10;
```
```
        printf("%d %dn", x.k, p);
```
```
    }
```

a) Compile time error
b) 10 10
c) Depends on the standard
d) Depends on the compiler
Answer: b
Clarification: None.

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

```
    #include 
```
```
    struct p
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
        float f;
```
```
    };
```
```
    int p = 10;
```
```
    int main()
```
```
    {
```
```
        struct p x = {1, 97};
```
```
        printf("%f %dn", x.f, p);
```
```
    }
```

a) Compile time error
b) 0.000000 10
c) Somegarbage value 10
d) 0 10
Answer: b
Clarification: None.

7. What will be the output of the following C code according to C99 standard?

```
    #include 
```
```
    struct p
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
        float f;
```
```
    };
```
```
    int main()
```
```
    {
```

        struct p x = {.c = 97, .f = 3, .k = 1};

```
        printf("%fn", x.f);
```
```
    }
```

a) 3.000000
b) Compile time error
c) Undefined behaviour
d) 1.000000
Answer: a
Clarification: None.

8. What will be the output of the following C code according to C99 standard?

```
    #include 
```
```
    struct p
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
        float f;
```
```
    };
```
```
    int main()
```
```
    {
```

        struct p x = {.c = 97, .k = 1, 3};

```
        printf("%f n", x.f);
```
```
    }
```

a) 3.000000
b) 0.000000
c) Compile time error
d) Undefined behaviour
Answer: b
Clarification: None.

9. What will be the output of the following C code according to C99 standard?

```
    #include 
```
```
    struct p
```
```
    {
```
```
        int k;
```
```
        char c;
```
```
        float f;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p x = {.c = 97};
```
```
        printf("%fn", x.f);
```
```
    }
```

a) 0.000000
b) Somegarbagevalue
c) Compile time error
d) None of the mentioned
Answer: a
Clarification: None.

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