Extern storage class - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an external variable.

C

extern int [1];

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

Aprintf

Bmain

Ccount

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function name instead of a variable name.

Trying to declare a keyword as a variable.

The keyword extern declares a variable defined in another file or scope. Here, count is the external variable name.

2fill in blank

medium

Complete the code to define the external variable declared elsewhere.

C

int [1] = 10;

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

Acount

Bprintf

Cextern

Dmain

Attempts:

3 left

💡 Hint

Common Mistakes

Using extern keyword when defining the variable.

Using a different variable name than declared.

The variable count is defined here with an initial value. It matches the external declaration.

3fill in blank

hard

Fix the error in the code to correctly use the external variable.

C

extern int [1];

void printCount() {
    printf("Count is %d\n", [1]);
}

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

Amain

Bcount

Cprintf

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names in declaration and usage.

Using function names instead of variable names.

The variable count must be used consistently as the external variable name.

4fill in blank

hard

Fill both blanks to declare and initialize an external variable correctly.

C

extern [1] [2];

// Defined in another file

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

Aint

Bfloat

Ccount

Dtotal

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing data type and variable name order.

Using a float type when the variable is integer.

The external variable count is declared as type int.

5fill in blank

hard

Fill all three blanks to define and use an external variable properly.

C

int [1] = 5;

extern int [2];

void display() {
    printf("Value: %d\n", [3]);
}

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

Atotal

Bcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for definition and external declaration.

Mismatching variable names in usage.

The variable total is defined, count is declared external and used in the function.