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Aprende Types of Variables | Variables
Introduction to C++

book
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:

int num = 42;
cout << num;
12
int num = 42; cout << num;
copy

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

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

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

python
int a, b;
a = 4;
b = 3;
Tarea

Swipe to start coding

Practice:

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

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

Solución

#include <iostream>
using namespace std;

int main() {
// Declaration
string x;

// Assign and reassign the variable
x = "Hello";
x = "Bye";

// Print the result
cout << x;
return 0;
}

¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

Sección 2. Capítulo 1
#include <iostream>
using namespace std;

int main() {
// Declaration
_ _ _

// Assign and reassign the variable
x = _ _ _
_ _ _ = "Bye";

// Print the result
_ _ _
return 0;
}

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