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Storage Classes and Type Qualifiers in C

This Quiz on Storage Classes and Type Qualifiers in C will help you to test and validate your knowledge about the topic. It covers a variety of questions, from basic to advanced. The quiz contains 20 questions. You just have to assess all the given options and click on the correct answer.

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Question 1

Which of the following is NOT a storage class in C?

auto
static
register
volatile

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Question 2

What does the extern storage class specify?

Internal linkage
Global variable with static scope
Declaration of a variable defined elsewhere
Immediate memory allocation

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Question 3

What is the default storage class for local variables in C?

static
auto
extern
register

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Question 4

What is the key feature of a static variable inside a function?

It is shared across all functions
It resets every time the function is called
It retains its value between function calls
It is allocated in the CPU register

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Question 5

Which qualifier tells the compiler not to optimize access to a variable?

static
restrict
const
volatile

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Question 6

What will be the output of the following code?

#include <stdio.h>

void demo() {
    static int count = 0;
    count++;
    printf("%d ", count);
}

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

1 1 1
1 2 3
0 1 2
2 3 4

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Question 7

What will be the output of the following code?

#include <stdio.h>

int x = 10;

void print() {
    extern int x;
    printf("%d\n", x);
}

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

10
Garbage Value
Compilation Error
0

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Question 8

What is the output of this code?

#include <stdio.h>

int main() {
    register int x = 5;
    printf("%d\n", x);
    return 0;
}

Compilation Error
5
0
Undefined behaviour

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Question 9

What will happen when this code runs?

#include <stdio.h>

int main() {
    const int a = 5;
    int *p = &a;
    *p = 10;
    printf("%d\n", a);
    return 0;
}

5
10
Compilation error
Undefined Behaviour

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Question 10

Which variable will retain its value across multiple calls?

#include <stdio.h>

void fun() {
    auto int x = 0;
    x++;
    printf("%d ", x);
}

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

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C Quiz

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