Types of Variables

In the previous chapters, we printed some expressions. However, what to do if we need to store these expressions for future usage? In C++ (like in other programming languages) there are containers to keep data - variables. For each type of data (numbers, strings, characters) there is a type of variable.

Let’s take a look at the most often used types:

Why do we need to know the type of each variable? In Python, for example, you can store the data without worrying about its type.

When you declare variables in C++, the type of variable is a mandatory parameter, so knowing and correctly using data types will help to avoid many mistakes.

Let's look at an example of a variable declaration:


              12
            
int num = 42; 
cout << num;

You can also reassign your variable if it’s needed:


              123
            
double num = 3.2;
num = 12.44;
cout << num;

You might also declare a variable but assign the value later or define the multiple variables of the same type in one declaration:

python

Opgave

Swipe to start coding

Practice:

Declare the variable x type of string.
Assign the value "Hello" to the variable x ( don’t forget about double quotes).
Reassign x to the "Bye".
Print the variable x after these operations.

Don’t forget about semicolon ; at the end of lines.

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

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Sektion 2. Kapitel 1

Types of Variables

Let’s take a look at the most often used types:

Why do we need to know the type of each variable? In Python, for example, you can store the data without worrying about its type.

When you declare variables in C++, the type of variable is a mandatory parameter, so knowing and correctly using data types will help to avoid many mistakes.

Let's look at an example of a variable declaration:


              12
            
int num = 42; 
cout << num;

You can also reassign your variable if it’s needed:


              123
            
double num = 3.2;
num = 12.44;
cout << num;

You might also declare a variable but assign the value later or define the multiple variables of the same type in one declaration:

python

Opgave

Swipe to start coding

Practice:

Declare the variable x type of string.
Assign the value "Hello" to the variable x ( don’t forget about double quotes).
Reassign x to the "Bye".
Print the variable x after these operations.

Don’t forget about semicolon ; at the end of lines.

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 1

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder