C语言数组小结

实例程序1：

# include <stdio.h>

int main(void)
{
    int a[4] = {1,2,3,4};  //数组的名字是a,数组的长度是4
    for (int i=0; i<4; i++)
    {
        printf("%d
",a[i]);
    }
    return 0;
}




import java.util.ArrayList;

public class App1
{
     public static void main(String[] args)
     {
         int[] a = {1,2,3,4};  //定义一个一维数组,变量的名字分别是a[0]、a[1]、a[2]……
         for (int i=0; i<a.length; i++)
         {
             System.out.println(a[i]);       
         }   
     }
}

实例程序2：

# include <stdio.h>

//本程序用来测试break的用法
int main(void)
{
    int a[5]; //定义一个一维数组,共含有5个元素

    scanf("%d",&a[0]);
    printf("a[0]的数值是:%d
",a[0]);
    scanf("%d",&a[3]);
    printf("a[3]的数值是:%d
",a[3]);

    for (int i=0; i<5; i++)
    {
       printf("%d	",a[i]);
    }
    return 0;
}

运行结果：

实例程序3：倒置

# include <stdio.h>

//本程序用来测试一维数组的倒置
int main(void)
{
    int a[7] = {1,2,3,4,5,6,7};

    int i = 0;
    int j = 6;
    int t;
    while (i < j)
    {
       t = a[i];
       a[i] = a[j];
       a[j] = t;
       i++;
       j--;
    }

    for (int k=0; k<7; k++)
    {
       printf("%d 	",a[k]);
    }
    return 0;
}


//运行结果:7 6 5 4 3 2 1



import java.util.ArrayList;
import java.util.Collections;

public class App1
{
     public static void main(String[] args)
     {
         //Collection的接口的实现类:Set、List本身并没有提供导致、排序等方法,
         //这些方法是由Collections提供的
         ArrayList arr = new ArrayList();
         for (int i=0; i<7; i++)
         {
             arr.add(i);
             System.out.println(arr.get(i));
         }
         System.out.println("---------------");
         //接下来进行倒置
         Collections.reverse(arr);
         for (int i=0; i<7; i++)
         {
             System.out.println(arr.get(i));
         }
     }
}

0
1
2
3
4
5
6
---------------
6
5
4
3
2
1
0

实例程序4：二维数组通过嵌套循环进行输出

# include <stdio.h>


int main(void)
{
        int arr[3][3] = {{1,2,3},
                         {4,5,6},
                        {7,8,9}};
        for (int i=0; i<3; i++)  //行数
        {
            for (int j=0; j<3; j++)
            {
                printf("%d	",arr[i][j]);;
            } 
            printf("
");
        }
    return 0;
}


public class App1
{
     public static void main(String[] args)
     {
        int[][] arr = {{1,2,3},
                       {4,5,6},
                       {7,8,9}};
        for (int i=0; i<3; i++)  //行数
        {
            for (int j=0; j<3; j++)
            {
                System.out.print(arr[i][j]+"	");
            } 
            System.out.println("
");
        }
        System.out.println("二维数组的长度是:"+arr.length);//长度是3,而不是12
     }
}

//运行结果:
1   2   3   

4   5   6   

7   8   9   

二维数组的长度是:3