Aprenda Kotlin Data Types | Kotlin Variables and Data Types

Kotlin includes several built-in data types that you will use frequently as you write programs. Understanding these types helps you store and work with different kinds of information in your code. The most common data types in Kotlin are:

Int: use this type to store whole numbers, such as counts, ages, or any value without a fractional part;
Double: use this type for numbers with decimals, like measurements or calculations that require precision;
Boolean: use this type for values that can only be either true or false, such as flags or conditions;
String: use this type to store text, such as names, messages, or any sequence of characters.

Each data type serves a specific purpose, and choosing the right one makes your code clearer and safer. Next, you will see how to declare variables of these types and print their values.

Main.kt


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package com.example

fun main() {
    // Integer value
    val age: Int = 25
    // Double value
    val height: Double = 1.75
    // Boolean value
    val isStudent: Boolean = true
    // String value
    val name: String = "Alex"

    println("Name: $name")
    println("Age: $age")
    println("Height: $height")
    println("Is student: $isStudent")
}

In this code, you see four variables, each using a different Kotlin data type. The variable age is declared as an Int to hold a whole number. The variable height uses the Double type for a decimal value. The isStudent variable is a Boolean, representing a true/false condition. Finally, name is a String, storing a sequence of characters. Each variable is printed using string templates, which let you easily include variable values in text output. This example shows how each data type is used in practice and how you can display their values in your program.

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Int: use this type to store whole numbers, such as counts, ages, or any value without a fractional part;
Double: use this type for numbers with decimals, like measurements or calculations that require precision;
Boolean: use this type for values that can only be either true or false, such as flags or conditions;
String: use this type to store text, such as names, messages, or any sequence of characters.

Each data type serves a specific purpose, and choosing the right one makes your code clearer and safer. Next, you will see how to declare variables of these types and print their values.

Main.kt


              1234567891011121314151617
            
package com.example

fun main() {
    // Integer value
    val age: Int = 25
    // Double value
    val height: Double = 1.75
    // Boolean value
    val isStudent: Boolean = true
    // String value
    val name: String = "Alex"

    println("Name: $name")
    println("Age: $age")
    println("Height: $height")
    println("Is student: $isStudent")
}

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 2. Capítulo 2