# 函數傳遞陣列

### 一、傳遞一維陣列

> 要傳遞一維陣列到函數裡，只要指名傳入的引數是一個陣列即可。

```
public class ch07_5 {

	public static void main(String[] args) {
		int score[]={9,14,6,18,2,10};
		largest(score);
	}

	public static void largest(int arr[]){
		int max=arr[0];
		for(int i=0; i<arr.length; i++)
			if(max<arr[i])
				max=arr[i];
		System.out.println("largest num = "+max);

	}
}
```

OUTPUT：\
largest num = 18

{% hint style="info" %}
如果要傳遞陣列到函數裡，只要在函數內填上陣列的名稱即可。

如以上範例的第五行：

```
largest(score);
```

{% endhint %}

### 二、傳遞二維陣列

```
public class ch07_6 {

	public static void main(String[] args) {
		int score[][]={{9,14,6,18,2,10},{18,32,65,27,30,17}};
		largest(score);
	}

	public static void largest(int arr[][]){
		int max=arr[0][0];
		for(int i=0; i<arr.length; i++)
			  for(int j=0; j<arr[i].length; j++)
				  if(max<arr[i][j])
					  max=arr[i][j];
		System.out.println("largest num = "+max);

	}
}
```

OUTPUT：\
largest num = 65

在主程式main 當中，score函數改為二維函數；\
而相同在函數內填上陣列名稱；

在函數largest 中，記得改為接收二維陣列 （本範例為整數陣列，固宣告二維整數陣列）。

### 三、函數資料型態注意

{% hint style="info" %}
傳回陣列函數該注意的是：

如果為整數陣列，必須在函數前加上int\[]&#x20;

若是二維陣列則加上int\[]\[]，以此類推。
{% endhint %}

```
public class ch07_7 {

	public static void main(String[] args) {
		int a[]={9,14,6,18,2,10};
		int b[];
		b=add5(a);
		for(int i=0; i<a.length; i++)
			System.out.print(b[i]+" ");
		System.out.println();
	}

	public static int[] add5(int arr[]){
		for(int i=0; i<arr.length; i++)
			arr[i]+=5;
		return arr;
	}

}
```

OUTPUT： \
14 19 11 23 7 15


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