Auto storage class - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an automatic variable inside the function.

C

void func() {
    [1] int x = 10;
}

Drag options to blanks, or click blank then click option'

Aauto

Bstatic

Cregister

Dextern

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'static' instead of 'auto' for local variables.

Confusing 'extern' with 'auto'.

The auto keyword declares an automatic variable inside a function, which is the default storage class.

2fill in blank

medium

Complete the code to declare a local variable with automatic storage class explicitly.

C

int main() {
    [1] int count = 5;
    return 0;
}

Drag options to blanks, or click blank then click option'

Aextern

Bauto

Cstatic

Dregister

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'static' which gives the variable static storage duration.

Using 'extern' which declares an external variable.

Using auto explicitly declares a variable with automatic storage class inside a function.

3fill in blank

hard

Fix the error in the code by choosing the correct storage class for the variable inside the function.

C

void example() {
    [1] int num = 100;
    printf("%d", num);
}

Drag options to blanks, or click blank then click option'

Aauto

Bextern

Cstatic

Dregister

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extern' inside a function which is invalid.

Using 'static' changes the storage duration.

The variable inside the function should have automatic storage class, declared with auto.

4fill in blank

hard

Fill both blanks to declare two automatic variables inside the function.

C

void test() {
    [1] int a = 1;
    [2] int b = 2;
}

Drag options to blanks, or click blank then click option'

Aauto

Bstatic

Dregister

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing 'auto' and 'static' for local variables.

Using 'register' unnecessarily.

Both variables are declared with auto storage class, which is the default for local variables.

5fill in blank

hard

Fill all three blanks to declare three automatic variables inside the function, where later variables depend on previous ones.

C

void func() {
    [1] int x = 5;
    [2] int y = x + 10;
    [3] int z = y * 2;
}

Drag options to blanks, or click blank then click option'

Aauto

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Declaring the first variable as static thinking it needs to persist, but all should be automatic.

Using static for all variables.

All three variables are declared with auto storage class for automatic storage duration. Each function call creates new instances.