MCQ on C Storage Classes and Type Qualifiers

MCQ on Storage Classes in C with answers and explanations for placement tests and job interviews. These solved C MCQ on Storage Classes MCQ are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our Storage Classes MCQ ( Storage Classes multiple Choice Questions ) focuses on all areas of the Storage Classes and their concept. We will regularly update the quiz and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

We have already published a blog post that contains short questions on storage classes. If you want you can also see this blog post “C Storage Classes specifiers“.

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In this MCQ on Storage Classes, we have also implemented a feature that not allowed the user to see the next question or finish the quiz without attempting the current storage Classes specifiers MCQ.

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C MCQ on Storage Classes

C Programming Multiple Choice Questions And Answers

C MCQ on Storage Classes: C Storage Classes Multiple Choice Questions and Answers

1 / 50

Which of the following statement is correct?

(i) A function can also be declared as static.
(ii) The default value of an external storage class variable is zero.

Only I is correct

Only II is correct

Both I & II are correct

Both I & II are incorrect

2 / 50

Consider the following C function

int fun(int n)
{
    static int data = 1;
    if (n >= 5)
    {
        return n;
    }
    n = n+data;
    data++;
    return fun(n);
}

The value returned by f(1) is

3 / 50

Which of the following is not a storage class specifier in C?

auto

volatile

extern

static

typedef

4 / 50

What is the output?

#include <stdio.h>

int main()
{
    int x = 10;
    static int y = x;

    if(x == y)
    {
        printf("Equal");
    }
    else if(x > y)
    {
        printf("Greater");
    }
    else
    {
        printf("Less");
    }
    return 0;
}

Greater

Less

Compiler Error

Equal

5 / 50

What will be the output of the following code?

#include<stdio.h>

int main()
{
    extern int a;
    static char j = 'E';
    printf("%c %d", ++j, ++a);
    return 0;
}

E , 1

F, 1

F , garbage

linker error

None of the above

6 / 50

The typedef specifier is called a

Data types

storage-class specifier

identifier

type-specifier:

None of the above

7 / 50

What will be the output of the following program?

#include <stdio.h>

static int y = 1;

int main()
{
    static int z;
    printf("%d %d", y, z);
    return 0;
}

0 ,0

1, 0

0, 1

1, 1

Garbage value

8 / 50

What is the output?

#include <stdio.h>

int main()
{
  extern int data;
  printf("%d ", data);
  {
       int data = 10;
       printf("%d ", data);
  }

  return 0;
}

0 10

10 10

Compiler Error

None of the above

9 / 50

What is the output?

#include <stdio.h>

int a, b, c = 0;

void prtFun (void)
{
    register int a = 2;
    int b = 1;
    a += ++b;
    printf ("\n %d %d ", a, b);
}

int main ()
{
    auto int a = 1;
    prtFun();
    a += 1;
    prtFun();
    printf ( "\n %d %d ", a, b) ;
    return 0;
}

4 2 6 1 6 1

4 2 4 2 2 0

4 2 6 2 2 0

None of the above

10 / 50

What is the output?

#include <stdio.h>

int main()
{
    static int data=5;
    if(--data)
    {
        printf("%d ",data);
        main();
    }
    return 0;
}

1 2 3 4

4 3 2 1

4 4 4 4

0 0 0 0

11 / 50

Consider the following pseudocode:

x : integer := 1
y : integer := 2
procedure add
x := x + y

procedure second (P: procedure)
x : integer := 2
P()
procedure first
y : integer := 3
second(add)
first()
write_integer (x)

What does it print if the language uses dynamic scoping with deep-binding?

ISRO CS 2013

12 / 50

Which of the following is correct for a function definition along with a storage-class specifier in C language?

int fun(auto int arg)

int fun(extern int arg)

int fun(static int arg)

int fun(register int arg)

All of the above

13 / 50

What is the output of the below code?

#include<stdio.h>

int init()
{
    return 10;
}

int main()
{
    static int data = init();
    printf(" value of data = %d", data);
    return 0;
}

Compiler Error

None of these

14 / 50

What will be the output of the following code?

#include <stdio.h>

static int data = 5;

int main()
{
    int sum = 0;
    do
    {
        sum += (1/data);
    }
    while(0 < data--);
    printf("sum of the series is %d", sum);

    return 0;
}

It will produce a compilation error.

It will print the sum of the series 1/5+1/4+…+1/1.

It will produce a run time error.

None of these

15 / 50

What is the output of the below code?

#include <stdio.h>
#include <string.h>

char *fun()
{
    static char arr[1024];
    return arr;
}

int main()
{
    char *str = "Aticleworld.com";
    strcpy(fun(), str);
    str = fun();
    strcpy(str, "AticleworldMCQs");
    printf("%s", fun());
    return 0;
}

Aticleworld.com

Garbage value

AticleworldMCQs

Compiler Error

16 / 50

The output of the following program?

#include <stdio.h>

int main()
{
    static int data=5;
    if(--data)
    {
        main();
        printf("%d ",data);
    }
    return 0;
}

0 0 0 0

4 3 2 1

Compiler Error

1 2 3 4

17 / 50

Which of the following statement are correct?

(i) The maximum value a variable can hold depends upon its storage class.
(ii) By default all variables enjoy a static storage class.

Only i is correct

Only ii is correct

Both i & ii are correct

Both i & ii are incorrect

18 / 50

In C, static storage class cannot be used with:

Function parameter

Global variable

Function name

Local variable

19 / 50

Which of the following statement is correct about the code snippet given below?

#include<stdio.h>

int bomb();

extern int p;
int sum = 5;

int main()
{
    p = bomb();
    printf("%d %d", sum, p);
    return 0;
}

int p;

int bomb()
{
    sum ++;
    return (sum);
}

The code reports an error as expression syntax

The code gives an output as 6 , 6

The code gets compiled successfully but will not give any output

None of the above

20 / 50

What is the output of the below code?

#include<stdio.h>

int test()
{
    static int data = 0;
    data++;
    return data;
}

int main()
{
    printf("data = %d\n", test());
    printf("data = %d\n", test());
    return 0;
}

1 , 2

1 , 1

2 , 1

0 , 1

Compiler Error

21 / 50

In the context of C data types, which of the following is correct?

“unsigned long double” is a valid data type.

“unsigned long long int” is a valid data type.

“long long double” is a valid data type.

A), B) and C) all are invalid data types.

A), B) and C) all are valid data types.

22 / 50

What is the output of the below code?

#include<stdio.h>

int main()
{
    extern int var;
    var = 10;
    printf("%d",var);

    return 0;
}
int var = 0;

garbage value

Compiler Error

23 / 50

The same identifier can not denote more than one entity in the same scope or namespaces.

True

False

24 / 50

What is the output?

#include<stdio.h>

int main()
{
    typedef int i;

    i data = 0;

    printf("%d", data);

    return 0;
}

Compiler Error

Runtime Error

25 / 50

What is the output?

#include<stdio.h>

int main()
{
    typedef static int *ptr;

    int data;

    ptr a = &data;

    printf("%d", *a);

    return 0;
}

Random value

Compiler Error

None of the above

26 / 50

What is the output?

#include <stdio.h>

int main()
{
    int data = 5;

    int const * ptr = &data;

    ++(*ptr);

    printf("%d", data);

    return 0;
}

Runtime Error

Compiler Error

27 / 50

Which of the following storage classes have global visibility in C/C++ ?

auto

extern

static

28 / 50

What is the output?

#include <stdio.h>

int main()
{
    int data = 5;

    int * const ptr = &data;

    ++(*ptr);

    printf("%d", data);

    return 0;
}

Runtime Error

Compiler Error

29 / 50

What is the output of the below code?

#include<stdio.h>

int main()
{
    {
        int a = 10;
    }
    printf("value of a = %d\n",a);

    return 0;
}

garbage value

Compiler Error

30 / 50

If only one memory location is to be reserved for a class variable, no matter how many objects are instantiated, then the variable should be declared as?

ISRO CS 2014

extern

volatile

static

const

31 / 50

What will be the storage class of variable I in the code written below?

#include <stdio.h>

int main()
{
    int i = 10;
    printf("%d", i);
    return 0;
}

Static storage class

Extern storage class

Automatic storage class

32 / 50

What is the output of the below code?

#include<stdio.h>

int test()
{
    int data = 0;
    data++;
    return data;
}

int main()
{
    printf("data = %d\n", test());
    printf("data = %d\n", test());
    return 0;
}

0 , 0

1 , 1

1, 2

0 , 1

33 / 50

What is the output of the below code?

#include <stdio.h>

int main()
{
    int data = 10;
    const int *ptr = &data;
    *ptr = 100;
    printf("data = %d\n", data);

    return 0;
}

data = 100

data = 10

Compiler Error

None of these

34 / 50

What is the output?

#include <stdio.h>

int fun()
{
    static int num = 16;
    return num--;
}

int main()
{
    for(fun(); fun(); fun())
    {
        printf("%d ", fun());
    }
    return 0;
}

Infinite loop

13 10 7 4 1

14 11 8 5 2

None of the above

35 / 50

Which of the following statement are correct?

(i) The value stored in the CPU register can always be accessed faster than that stored in memory.
(ii) A register storage class variable will always be stored in a CPU register.

Both I & II are incorrect

Both I & II are correct

Only II is correct

Only I is correct

36 / 50

What will be the output of the following code?

#include<stdio.h>

void test();

int main()
{
    goto abc;

    printf("hello\n");

    return 0;
}

void test()
{
abc:
    printf("world\n");
}

print hello

print world

print hello world

Compiler Error

None of the above

37 / 50

What is the output?

#include <stdio.h>

int main()
{
    register int i = 10;
    int *ptr = &i;
    printf("%d", *ptr);
    return 0;
}

Prints 0 on all compilers

May generate compiler Error

Prints 10 on all compilers

None of the above

38 / 50

What is the output of the following program?

#include<stdio.h>

int main()
{
    static int a = 7;

    printf("%d", a --);

    return 0;
}

Compiler Error

39 / 50

The output of the following program?

#include <stdio.h>

int fun(int n)
{
    static int s = 0;
    s = s + n;
    return (s);
}

int main()
{
    int data = 10, x;
    while (data > 0)
    {
        x = fun(data);
        data--;
    }
    printf ("%d ", x);
    return 0;
}

120

100

40 / 50

For the following “typedef” in C, pick the best statement

//new type

typedef int INT, *INTPTR, ONEDARR[10], TWODARR[10][10];

“INT x” would define x of type int. “INTPTR *y” would define pointer y of type int **. “ONEDARR z” would define z as array of 10 int. “TWODARR t” would define t as array of 10 by 10 int.

“INT x” would define x of type int and “INTPTR y” would define pointer y of type int *. Remaining part of the statement would be ignored.

“INT x” would define x of type int. “INTPTR y” would define pointer y of type int *. ONEDARR is an array of 10 int. TWODARR is a 2D array of 10 by 10 int.

“INT x” would define x of type int. Remaining part of the statement would be ignored.

41 / 50

The lifetime of a variable refers to

It is the duration for which storage is guaranteed to be reserved for it

The portion of a program in which the variable may be visible.

Internal linkage of a variable.

External linkage of a variable.

None of these

42 / 50

What is the output of the below code,

#include <stdio.h>

int a, b, c = 0;

void prtFun (void)
{
    static int a = 2;
    int b = 1;
    a += ++b;
    printf ("\n %d %d ", a, b);
}

int main ()
{
    static int a = 1;
    prtFun();
    a += 1;
    prtFun();
    printf ( "\n %d %d ", a, b) ;
}

4 2 6 2 2 0

3 1 4 1 4 2

4 2 6 1 6 1

3 1 5 2 5 2

43 / 50

Which is not a storage class?

auto

struct

Typedef

static

_Thread_local

44 / 50

Consider the following C function, what is the output?

#include <stdio.h>

int fun(int n)
{
    static int r = 0;
    if (n <= 0)
        return 1;
    if (n > 3)
    {
        r = n;
        return fun(n-2)+2;
    }
    return fun(n-1)+r;
}

int main()
{
    printf("%d", fun(5));
    
    return 0;
}

45 / 50

In case of a conflict between the names of a local and global variable what happens?

The global variable is given a priority.

The local variable is given a priority.

Which one will get a priority depends upon which one is defined first.

The compiler reports an error.

46 / 50

Pick the correct statement for const and volatile.

const is the opposite of volatile and vice versa.

const and volatile can’t be used for enum.

const and volatile can’t be used for struct and union.

const and volatile are independent i.e. it’s possible that a variable is defined as both const and volatile.

const and volatile can’t be used for typedef.

None of the above

47 / 50

What will be the output of the following code?

#include <stdio.h>

static int data = 5;

int main()
{
    int sum = 0;
    do
    {
        sum += data;
    }
    while(0 < data--);
    printf("sum of the series is %d", sum);

    return 0;
}

Compiler Error

None of the above

48 / 50

What will be the output of the following program?

#include<stdio.h>

void fun()
{
    auto int I = 1;
    register char a = 'D';
    static int p = 0;
    printf("%d %d %d", I, a, p);
}

int main()
{
    fun();
    return 0;
}

1, 68, 0

1, D, 0

1, 0, 0

1, D, 1

49 / 50

What is the output of the below code?

#include<stdio.h>

int main()
{
    extern int var;

    printf("%d",var);

    int var = 0;

    return 0;
}

Compiler Error

garbage value

50 / 50

What will be the output of the following program?

#include< stdio.h>

int main()
{
    static unsigned int a = 23;
    register unsigned char c = ‘R’;
    auto long unsigned q = 345L;
    static long signed p = 345L;
    
    printf("a = %u c = %c", a,c);
    printf("\nq = %ld p = %ld", q, p);
    
    return 0;
}

A=23 c=R 0 0

Garbage value

a=23 c=R q = 345 p = 345

A=23 c=R q = 345 p = 345

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MCQ on C Storage Classes and Type Qualifiers

Guideline of MCQ on Storage Classes:

You have 1 hours to take the C Storage Classes MCQs

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