> For the complete documentation index, see [llms.txt](https://educacion.gitbook.io/programacion/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://educacion.gitbook.io/programacion/exercicios-java/ud2-solucions/bucles/exercicios-introductorios.md).

# Exercicios introductorios

1. Intenta **SEN UTILIZAR O IDE** determinar cal e a saida dos seguintes códigos:
   1. 1 2 3 4 5 6 7 8 9
   2. 1 3 5 7 9
   3. Bucle infinito
   4. 10 9 8 7 6 5 4 3 2 1
   5. 20 21 22 23 24 25 26 27 28 29 30
   6. 23 24 25 26 27
   7. 30 29 28 27 26 25 24 23 22 21 20
   8. Bucle infinito
   9. 10
   10. 10 14 18
2. Mostrar por pantalla a frase "Probando os bucles" n veces, sendo n un número que introduce un usuario por pantalla. Utilizar un bucle FOR

```java
import java.util.Scanner;

public class Exercicio1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("Introduce o número de veces (n): ");
        int n = scanner.nextInt();
        
        for (int i = 0; i < n; i++) {
            System.out.println("Probando os bucles");
        }
        
        scanner.close();
    }
}
```

3. Escribe un programa mostre por pantalla os n primeiros números naturales, sendo n un valor que introduce o usuario por pantalla. Utilizar un bucle WHILE

```java
import java.util.Scanner;

public class Exercicio2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("Introduce o valor de n: ");
        int n = scanner.nextInt();
        
        int i = 1;
        while (i <= n) {
            System.out.println(i);
            i++;
        }
        
        scanner.close();
    }
}
```

4. Escribe un programa que pida números o usuario por pantalla e escriba "O número introducido é N" mentras que o numero introducido non sexa múltiplo de 4. Se o numero é múltiplo de 4 mostrara a mensaxe por pantalla e finalizará a execución.

```java
import java.util.Scanner;

public class MathJava {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int numero;

        do {
            System.out.print("Introduce un número: ");
            numero = scanner.nextInt();
            System.out.println("O número introducido é " + numero);

        } while (numero % 4 != 0);
        System.out.println("Finalizando programa.");
        scanner.close();
    }
}

```

5. Conta atras

```java
public class ParesSinModulo {
    public static void main(String[] args) {
        System.out.println("Números pares entre 100 e 1:");
        
        // Comezamos en 100 (par) e decrementamos de 2 en 2
        for (int i = 100; i >= 2; i -= 2) {
            System.out.println(i);
        }
    }
}
```

6. Tabla de multiplicar inversa

```java
public class TaboaMultiplicarInversa {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("De que número queres a taboa inversa? ");
        int numero = scanner.nextInt();
        
        System.out.println("Taboa de multiplicar inversa do " + numero + ":");
        
        // De 10 a 1 con incremento negativo
        for (int i = 10; i >= 1; i--) {
            System.out.println(numero + " x " + i + " = " + (numero * i));
        }
        
        scanner.close();
    }
}
```


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