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# Introducción Arrays

1. 98-61 - Suma o contido das posicións pares é impares
2. A chamada é arr.length, o incremento dos bucles non funciona, IndexOut of bounds

```
public static void main(String[] args){
        int [] arr = {10,20,30,40,50};
        int primeiro = arr[0];
        for (int i=0; i< arr.length-1; i+=1){
            arr[i]=arr[(i+1)%(arr.length)];
        }
        arr[arr.length - 1] = primeiro;
        for (int i=0; i<= arr.length-1;i+=1)
            System.out.println(arr[i]);
    }
```

3. Temperaturas

```java
public class Temperaturas {
    public static void main(String[] args) {
        int[] temperaturaMeses = new int[12];

        for (int i = 0; i < temperaturaMeses.length; i++) {
            temperaturaMeses[i] = (int) (Math.random() * 41); 
        }

        System.out.println("Temperaturas medias en A Coruña (ºC):");
        for (int i = 0; i < temperaturaMeses.length; i++) {
            System.out.println("Mes " + (i + 1) + ": " + temperaturaMeses[i] + "ºC");
        }
    }
}
```

4. Notas de alumnos

```java
public class NotasAlumnos {
    public static void main(String[] args) {
        double[] notasAlumnos = new double[20];

       
        for (int i = 0; i < notasAlumnos.length; i++) {
            notasAlumnos[i] = Math.round(Math.random() * 100) / 10.0; 
        }

        System.out.println("Notas dos alumnos:");
        for (int i = 0; i < notasAlumnos.length; i++) {
            System.out.println("Alumno " + (i + 1) + ": " + notasAlumnos[i]);
        }

        double suma = 0;
        double mayor = notasAlumnos[0];
        double menor = notasAlumnos[0];

        for (int i = 0; i < notasAlumnos.length; i++) {
            suma += notasAlumnos[i];
            if (nota > maior) 
                mayor = notasAlumnos[i];
            if (nota < menor) 
                menor = notasAlumnos[i];
        }

        double media = suma / notasAlumnos.length;

        System.out.printf("\nNota media: %.1f\n", media);
        System.out.printf("Nota máis alta: %.1f\n", mayor);
        System.out.printf("Nota máis baixa: %.1f\n", menor);
    }
}
```


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