Arrays of Structures - C Language Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Arrays of Structures – 1”.

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

1. The correct syntax to access the member of the ith structure in the array of structures is?

Assuming: struct temp
    {
        int b;
    }s[50];

a) s.b.[i];
b) s.[i].b;
c) s.b[i];
d) s[i].b;
View Answer

Answer: d
Explanation: None.

2. Comment on the output of the following C code.

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```
    #include <stdio.h>
```
```
    struct temp
```
```
    {
```
```
        int a;
```
```
        int b;
```
```
        int c;
```
```
    };
```
```
    main()
```
```
    {
```

        struct temp p[] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

```
    }
```

a) No Compile time error, generates an array of structure of size 3
b) No Compile time error, generates an array of structure of size 9
c) Compile time error, illegal declaration of a multidimensional array
d) Compile time error, illegal assignment to members of structure
View Answer

Answer: a
Explanation: None.

3. Which of the following uses structure?
a) Array of structures
b) Linked Lists
c) Binary Tree
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

4. What is the correct syntax to declare a function foo() which receives an array of structure in function?
a) void foo(struct *var);
b) void foo(struct *var[]);
c) void foo(struct var);
d) none of the mentioned
View Answer

Answer: a
Explanation: None.

5. What will be the output of the following C code? (Assuming size of int be 4)

```
    #include <stdio.h>
```
```
    struct temp
```
```
    {
```
```
        int a;
```
```
        int b;
```
```
        int c;
```
```
    } p[] = {0};
```
```
    main()
```
```
    {
```
```
        printf("%d", sizeof(p));
```
```
    }
```

a) 4
b) 12
c) 16
d) Can’t be estimated due to ambiguous initialization of array
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *name;
```
```
    };
```
```
    struct student s[2];
```
```
    void main()
```
```
    {
```
```
        s[0].name = "alan";
```
```
        s[1] = s[0];
```

        printf("%s%s", s[0].name, s[1].name);

```
        s[1].name = "turing";
```

        printf("%s%s", s[0].name, s[1].name);

```
    }
```

a) alan alan alan turing
b) alan alan turing turing
c) alan turing alan turing
d) run time error
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *name;
```
```
    };
```
```
    struct student s[2], r[2];
```
```
    void main()
```
```
    {
```
```
        s[0].name = "alan";
```
```
        s[1] = s[0];
```
```
        r = s;
```

        printf("%s%s", r[0].name, r[1].name);

```
    }
```

a) alan alan
b) Compile time error
c) Varies
d) Nothing
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *name;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student s[2], r[2];
```
```
        s[1] = s[0] = "alan";
```

        printf("%s%s", s[0].name, s[1].name);

```
    }
```

a) alan alan
b) Nothing
c) Compile time error
d) Varies
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student s[2];
```
```
        printf("%d", sizeof(s));
```
```
    }
```

a) 2
b) 4
c) 8
d) 0
View Answer

Answer: d
Explanation: None.

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