Incremento e Decremento

Increment

The increment operator, denoted by ++, is used to increase the value of a variable by 1. It is commonly used in loops to control the iteration process. There are two ways to use the increment operator:

Incremento

O operador de incremento, representado por "++", é utilizado para aumentar o valor de uma variável em 1. Ele é comumente usado em loops para controlar o processo de iteração. Existem duas formas de usar o operador de incremento:

Main


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int i = 0;
System.out.println(i++); // Output: 0
System.out.println(i);   // Output: 1

Pre-increment (++i): The variable's value is incremented before it is used in the expression. For example:

Main


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int i = 0;
System.out.println(++i); // Output: 1
System.out.println(i);   // Output: 1

Decrement

The decrement operator, denoted by --, is used to decrease the value of a variable by 1. It follows the same rules as the increment operator and can be used in a similar way.

Decremento

O operador de decremento, representado por "--", é usado para diminuir o valor de uma variável em 1. Segue as mesmas regras que o operador de incremento e pode ser utilizado de maneira semelhante.

Main


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package com.example;

public class Main {
  public static void main(String[] args) {
		System.out.println("Increment operation");
        for (int i = 0; i < 5; i++) {
            System.out.println("Iteration " + i);
        }
		System.out.println("Decrement operation");
        for (int j = 5; j > 0; j--) {
            System.out.println("Countdown " + j);
        }
    }
}

In the first for loop, the variable i is initialized to 0, incremented by 1 after each iteration, and the loop executes until i is no longer less than 5. This will output the numbers from 0 to 4.

In the second for loop, the variable j is initialized to 5, decremented by 1 after each iteration, and the loop executes until j is no longer greater than 0. This will output the numbers from 5 to 1 in descending order.

Nota

Os operadores de incremento (++) e decremento (--) são úteis para controlar o fluxo e a contagem em loops. Eles oferecem uma maneira conveniente de manipular variáveis durante a execução do loop.

main


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package com.example;

public class Main {
    public static void main(String[] args) {
        for (int i = 0; i < 50; i+=10) {
            System.out.println("The current value of `i` is " + i);
        }
    }
}

You can see in the code above how we increment the variable i by 10 with each iteration as long as i < 50.

This way, we can shorten and combine different operations while immediately assigning the result to a variable. Very useful!

1. What will be the output of the following code snippet?

2. What will be the output of the following code snippet?

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Seção 3. Capítulo 6