Type modifiers in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constant integer variable named num with value 10.

C++

const [1] num = 10;

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Aint

Bfloat

Cchar

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using a floating-point type like float or double instead of int.

Forgetting to add const before the type.

The const keyword makes the variable num constant, and int declares it as an integer type.

2fill in blank

medium

Complete the code to declare a pointer to a constant character named ptr.

C++

const char* [1];

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AcharPtr

BpChar

Cpointer

Dptr

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name different from ptr as asked.

Placing the asterisk incorrectly.

The variable name ptr is used as the pointer to a constant character.

3fill in blank

hard

Fix the error in the code by completing the type modifier to declare a volatile integer variable named counter.

C++

[1] int counter;

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Aconstant

Bmutable

Cvolatile

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using constant instead of volatile.

Using static which has a different meaning.

The volatile keyword tells the compiler that the variable counter can be changed unexpectedly, so it should not optimize it away.

4fill in blank

hard

Fill both blanks to declare a pointer to a volatile integer named p.

C++

[1] int [2] p;

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Avolatile

B*

C&

Dconst

Attempts:

3 left

💡 Hint

Common Mistakes

Using & instead of * for pointer declaration.

Placing const instead of volatile.

The keyword volatile modifies the integer type, and * declares p as a pointer.

5fill in blank

hard

Fill all three blanks to declare a constant pointer to a constant integer named ptr.

C++

[1] int [2] [3] ptr;

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

Aconst

B*

Dvolatile

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the second const to make the pointer constant.

Using volatile instead of const.

The first const makes the integer constant, the * declares a pointer, and the second const makes the pointer itself constant.