Why variables are needed in C++ - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer variable named age.

C++

int [1];

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

A5

Bcout

Cage

Dmain

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number instead of a variable name.

Using reserved words like 'main' or 'cout' as variable names.

The variable name age is used to store an integer value.

2fill in blank

medium

Complete the code to assign the value 10 to the variable score.

C++

score [1] 10;

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A!=

B==

C+=

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '=' for assignment.

Using '+=' when just assigning a value.

The single equals sign = is used to assign a value to a variable.

3fill in blank

hard

Fix the error in the code to correctly declare and initialize a variable.

C++

int [1] = 5.5;

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Anum

B5.5

Cnumber

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number as a variable name.

Using a type name like 'double' as a variable name.

The variable name should be a valid identifier like num. The value 5.5 is a double, but here we focus on the variable name.

4fill in blank

hard

Fill both blanks to declare a variable and assign it a value.

C++

[1] [2] = 20;

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

Aint

Bfloat

Ccount

Dtotal

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping type and variable name.

Using a type name as a variable name.

We declare an integer variable named count and assign it the value 20.

5fill in blank

hard

Fill all three blanks to declare a float variable, assign a value, and print it.

C++

#include <iostream>
using namespace std;

int main() {
    [1] [2] = 3.14f;
    cout << [3] << endl;
    return 0;
}

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

Afloat

Bpi

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' for decimal values.

Printing a variable name different from the declared one.

We declare a float variable pi, assign 3.14, and print pi.