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C Programming Structures, Unions, Enums Online Test

By Raju Choudhary On Feb 13, 2019

C Programming Structures, Unions, Enums Online Test

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C Programming Structures, Unions, Enums Online Test. C Programming Question and Answers in English. C Programming Structures, Unions, Enums Online mock test paper is free for all students and Very Helpful for Exam Preparation. C Programming Structures, Unions, Enums Online Quiz. C Programming Online Mock test for Structures, Unions, Enums Topic. Here we are providing C Programming Structures, Unions, Enums Online Test Series in English. Check C Programming Mock Test Series 2019-2019.

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Question 1 of 30

1. Question
How will you free the allocated memory ?
- remove(var-name);
- free(var-name);
- delete(var-name);
- dalloc(var-name);
Correct

Incorrect
Question 2 of 30

2. Question
What is the similarity between a structure, union and enumeration?
- All of them let you define new values
- All of them let you define new data types
- All of them let you define new pointers
- All of them let you define new structures
Correct

Incorrect

Question 3 of 30

3. Question

What will be the output of the program ?

#include

int main()
{
    union var
    {
        int a, b;
    };
    union var v;
    v.a=10;
    v.b=20;
    printf("%d\n", v.a);
    return 0;
}

Correct

Incorrect

Question 4 of 30

4. Question

What will be the output of the program ?

#include

int main()
{
    struct value
    {
        int bit1:1;
        int bit3:4;
        int bit4:4;
    }bit={1, 2, 13};

    printf("%d, %d, %d\n", bit.bit1, bit.bit3, bit.bit4);
    return 0;
}

1, 2, 13
1, 4, 4
-1, 2, -3
-1, -2, -13

Correct

Note the below statement inside the struct:

int bit1:1; –> ‘int’ indicates that it is a SIGNED integer.

For signed integers the leftmost bit will be taken for +/- sign.

If you store 1 in 1-bit field:

The left most bit is 1, so the system will treat the value as negative number.

The 2’s complement method is used by the system to handle the negative values.

Therefore, the data stored is 1. The 2’s complement of 1 is also 1 (negative).

Therefore -1 is printed.

If you store 2 in 4-bits field:

Binary 2: 0010 (left most bit is 0, so system will treat it as positive value)

0010 is 2

Therefore 2 is printed.

If you store 13 in 4-bits field:

Binary 13: 1101 (left most bit is 1, so system will treat it as negative value)

Find 2’s complement of 1101:

1’s complement of 1101 : 0010
2’s complement of 1101 : 0011 (Add 1 to the result of 1’s complement)

0011 is 3 (but negative value)

Therefore -3 is printed.

Incorrect

Note the below statement inside the struct:

int bit1:1; –> ‘int’ indicates that it is a SIGNED integer.

For signed integers the leftmost bit will be taken for +/- sign.

If you store 1 in 1-bit field:

The left most bit is 1, so the system will treat the value as negative number.

The 2’s complement method is used by the system to handle the negative values.

Therefore, the data stored is 1. The 2’s complement of 1 is also 1 (negative).

Therefore -1 is printed.

If you store 2 in 4-bits field:

Binary 2: 0010 (left most bit is 0, so system will treat it as positive value)

0010 is 2

Therefore 2 is printed.

If you store 13 in 4-bits field:

Binary 13: 1101 (left most bit is 1, so system will treat it as negative value)

Find 2’s complement of 1101:

1’s complement of 1101 : 0010
2’s complement of 1101 : 0011 (Add 1 to the result of 1’s complement)

0011 is 3 (but negative value)

Therefore -3 is printed.

Question 5 of 30

5. Question

What will be the output of the program in 16 bit platform (Turbo C under DOS) ?

#include

int main()
{
    struct value
    {
        int bit1:1;
        int bit3:4;
        int bit4:4;
    }bit;
    printf("%d\n", sizeof(bit));
    return 0;
}

Correct

Since C is a compiler dependent language, in Turbo C (DOS) the output will be 2, but in GCC (Linux) the output will be 4.

Incorrect

Since C is a compiler dependent language, in Turbo C (DOS) the output will be 2, but in GCC (Linux) the output will be 4.

Question 6 of 30

6. Question

What will be the output of the program ?

#include

int main()
{
    enum days {MON=-1, TUE, WED=6, THU, FRI, SAT};
    printf("%d, %d, %d, %d, %d, %d\n", MON, TUE, WED, THU, FRI, SAT);
    return 0;
}

-1, 0, 1, 2, 3, 4
-1, 2, 6, 3, 4, 5
-1, 0, 6, 2, 3, 4
-1, 0, 6, 7, 8, 9

Correct

Incorrect

Question 7 of 30

7. Question

What will be the output of the program ?

#include

int main()
{
    enum status {pass, fail, absent};
    enum status stud1, stud2, stud3;
    stud1 = pass;
    stud2 = absent;
    stud3 = fail;
    printf("%d %d %d\n", stud1, stud2, stud3);
    return 0;
}

0, 1, 2
1, 2, 3
0, 2, 1
1, 3, 2

Correct

Incorrect

Question 8 of 30

8. Question

What will be the output of the program ?

#include

int main()
{
    int i=4, j=8;
    printf("%d, %d, %d\n", i|j&j|i, i|j&j|i, i^j);
    return 0;
}

12, 12, 12
112, 1, 12
32, 1, 12
-64, 1, 12

Correct

Incorrect

Question 9 of 30

9. Question

What will be the output of the program in Turbo C (under DOS)?

#include

int main()
{
    struct emp
    {
        char *n;
        int age;
    };
    struct emp e1 = {"Dravid", 23};
    struct emp e2 = e1;
    strupr(e2.n);
    printf("%s\n", e1.n);
    return 0;
}

Error: Invalid structure assignment
DRAVID
Dravid
No output

Correct

Incorrect

Question 10 of 30

10. Question

What will be the output of the program in 16-bit platform (under DOS)?

#include

int main()
{
    struct node
    {
        int data;
        struct node *link;
    };
    struct node *p, *q;
    p = (struct node *) malloc(sizeof(struct node));
    q = (struct node *) malloc(sizeof(struct node));
    printf("%d, %d\n", sizeof(p), sizeof(q));
    return 0;
}

2, 2
8, 8
5, 5
4, 4

Correct

Incorrect

Question 11 of 30

11. Question

What will be the output of the program ?

#include

int main()
{
    struct byte
    {
        int one:1;
    };
    struct byte var = {1};
    printf("%d\n", var.one);
    return 0;
}

1
-1
0
Error

Correct

Incorrect

Question 12 of 30

12. Question

What will be the output of the program ?

#include

int main()
{
    enum days {MON=-1, TUE, WED=6, THU, FRI, SAT};
    printf("%d, %d, %d, %d, %d, %d\n", ++MON, TUE, WED, THU, FRI, SAT);
    return 0;
}

-1, 0, 1, 2, 3, 4
Error
0, 1, 6, 3, 4, 5
0, 0, 6, 7, 8, 9

Correct

Because ++ or — cannot be done on enum value.

Incorrect

Because ++ or — cannot be done on enum value.

Question 13 of 30

13. Question

What will be the output of the program ?

#include

    struct course
    {
        int courseno;
        char coursename[25];
    };
int main()
{
    struct course c[] = { {102, "Java"}, 
                          {103, "PHP"}, 
                          {104, "DotNet"}     };

    printf("%d ", c[1].courseno);
    printf("%s\n", (*(c+2)).coursename);
    return 0;
}

103 DotNet
102 Java
103 PHP
104 DotNet

Correct

Incorrect

Question 14 of 30

14. Question

What will be the output of the program given below in 16-bit platform ?

#include

int main()
{
    enum value{VAL1=0, VAL2, VAL3, VAL4, VAL5} var;
    printf("%d\n", sizeof(var));
    return 0;
}

Correct

Incorrect

Question 15 of 30

15. Question

Point out the error in the program?

struct emp
{
    int ecode;
    struct emp *e;
};

Error: in structure declaration
Linker Error
No Error
None of above

Correct

This type of declaration is called as self-referential structure. Here *e is pointer to a struct emp.

Incorrect

This type of declaration is called as self-referential structure. Here *e is pointer to a struct emp.

Question 16 of 30

16. Question

Point out the error in the program?

typedef struct data mystruct;
struct data
{
    int x;
    mystruct *b;
};

Error: in structure declaration
Linker Error
No Error
None of above

Correct

Here the type name mystruct is known at the point of declaring the structure, as it is already defined.

Incorrect

Here the type name mystruct is known at the point of declaring the structure, as it is already defined.

Question 17 of 30

17. Question

Point out the error in the program?

#include

int main()
{
    struct a
    {
        float category:5;
        char scheme:4;
    };
    printf("size=%d", sizeof(struct a));
    return 0;
}

Error: invalid structure member in printf
Error in this float category:5; statement
No error
None of above

Correct

Bit field type must be signed int or unsigned int.

The char type: char scheme:4; is also a valid statement.

Incorrect

Bit field type must be signed int or unsigned int.

The char type: char scheme:4; is also a valid statement.

Question 18 of 30

18. Question

Point out the error in the program?

struct emp
{
    int ecode;
    struct emp e;
};

Error: in structure declaration
Linker Error
No Error
None of above

Correct

The structure emp contains a member e of the same type.(i.e) struct emp. At this stage compiler does not know the size of sttructure.

Incorrect

The structure emp contains a member e of the same type.(i.e) struct emp. At this stage compiler does not know the size of sttructure.

Question 19 of 30

19. Question

Point out the error in the program?

#include

int main()
{
    struct emp
    {
        char name[20];
        float sal;
    };
    struct emp e[10];
    int i;
    for(i=0; i9; i++)
        scanf("%s %f", e[i].name, &e[i].sal);
    return 0;
}

Error: invalid structure member
Error: Floating point formats not linked
No error
None of above

Correct

At run time it will show an error then program will be terminated.

Sample output: Turbo C (Windows)

c:\>myprogram

Sample
12.123

scanf : floating point formats not linked
Abnormal program termination

Incorrect

At run time it will show an error then program will be terminated.

Sample output: Turbo C (Windows)

c:\>myprogram

Sample
12.123

scanf : floating point formats not linked
Abnormal program termination

Question 20 of 30

20. Question

Point out the error in the program?

#include
#include
void modify(struct emp*);
struct emp
{
    char name[20];
    int age;
};
int main()
{
    struct emp e = {"Sanjay", 35};
    modify(&e);
    printf("%s %d", e.name, e.age);
    return 0;
}
void modify(struct emp *p)
{
     p ->age=p->age+2;
}

Error: in structure
Error: in prototype declaration unknown struct emp
No error
None of above

Correct

The struct emp is mentioned in the prototype of the function modify() before declaring the structure.To solve this problem declare struct emp before the modify() prototype.

Incorrect

The struct emp is mentioned in the prototype of the function modify() before declaring the structure.To solve this problem declare struct emp before the modify() prototype.

Question 21 of 30

21. Question

Point out the error in the program in 16-bit platform?

#include

int main()
{
    struct bits
    {
        int i:40;
    }bit;

    printf("%d\n", sizeof(bit));
    return 0;
}

4
2
Error: Bit field too large
Error: Invalid member access in structure

Correct

Incorrect

Question 22 of 30

22. Question

Point out the error in the program?

#include

int main()
{
    union a
    {
        int i;
        char ch[2];
    };
    union a z1 = {512};
    union a z2 = {0, 2};
    return 0;
}

Error: invalid union declaration
Error: in Initializing z2
No error
None of above

Correct

Incorrect

Question 23 of 30

23. Question

Point out the error in the program?

#include

int main()
{
    struct emp
    {
        char n[20];
        int age;
    };
    struct emp e1 = {"Dravid", 23};
    struct emp e2 = e1;
    if(e1 == e2)
        printf("The structure are equal");
    return 0;
}

Prints: The structure are equal
Error: Structure cannot be compared using ' == '
No output
None of above

Correct

Incorrect

Question 24 of 30

24. Question

Point out the error in the program?

#include

int main()
{
    struct bits
    {
        float f:2;
    }bit;

    printf("%d\n", sizeof(bit));
    return 0;
}

4
2
Error: cannot set bit field for float
Error: Invalid member access in structure

Correct

Incorrect

Question 25 of 30

25. Question

Point out the error in the program?

#include

int main()
{
    struct emp
    {
        char name[25];
        int age;
        float bs;
    };
    struct emp e;
    e.name = "Suresh";
    e.age = 25;
    printf("%s %d\n", e.name, e.age);
    return 0;
}

Error: Lvalue required/incompatible types in assignment
Error: invalid constant expression
Error: Rvalue required
No error, Output: Suresh 25

Correct

We cannot assign a string to a struct variable like e.name = “Suresh”; in C.

We have to use strcpy(char *dest, const char *source) function to assign a string.

Ex: strcpy(e.name, “Suresh”);

Incorrect

We cannot assign a string to a struct variable like e.name = “Suresh”; in C.

We have to use strcpy(char *dest, const char *source) function to assign a string.

Ex: strcpy(e.name, “Suresh”);

Question 26 of 30

26. Question

Which of the following statements correct about the below program?

#include

int main()
{
    struct emp
    {
        char name[25];
        int age;
        float sal;
    };
    struct emp e[2];
    int i=0;
    for(i=0; i2; i++)
        scanf("%s %d %f", e[i].name, &e[i].age, &e[i].sal);

    for(i=0; i2; i++)
        scanf("%s %d %f", e[i].name, e[i].age, e[i].sal);
    return 0;
}

Error: scanf() function cannot be used for structures elements.
The code runs successfully.
Error: Floating point formats not linked Abnormal program termination.
Error: structure variable must be initialized.

Correct

Incorrect

Question 27 of 30

27. Question

Which of the following statements correct about the below program?

#include

int main()
{
    union a
    {
        int i;
        char ch[2];
    };
    union a u1 = {512};
    union a u2 = {0, 2};
    return 0;
}

1: u2 CANNOT be initialized as shown.
2: u1 can be initialized as shown.
3: To initialize char ch[] of u2 ‘.’ operator should be used.
4: The code causes an error ‘Declaration syntax error’

1, 2
2, 3
1, 2, 3
1, 3, 4

Correct

Incorrect

Question 28 of 30

28. Question

Which of the following statements correctly assigns 12 to month using pointer variable pdt?

#include

    struct date
    {
        int day;
        int month;
        int year;
    };
int main()
{
    struct date d;
    struct date *pdt;
    pdt = &d;
    return 0;
}

pdt.month = 12
&pdt.month = 12
d.month = 12
pdt->month = 12

Correct

Incorrect

Question 29 of 30

29. Question
A union cannot be nested in a structure
- True
- False
Correct

Incorrect
Question 30 of 30

30. Question
Nested unions are allowed
- True
- False
Correct

Incorrect

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C Programming Structures, Unions, Enums Online Test

C Programming Structures, Unions, Enums Online Test

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