数组的增删查查改

1、增

1.Cpp

#include <iostream>
using namespace std;
#include "add.h"int main() {//初始化数组int arr[5];//前四个元素为1，2，3，4for (int i = 0; i < 4; i++){arr[i] = i+1;}//数组第5个赋值为100arr[4] = 100;for (int i = 0; i < sizeof(arr)/sizeof(arr[0]); i++){cout << arr[i]<<" ";}system("pause");return 0;
}

2.Java

public class Main {public static void main(String[] args) {//初始化数组int [] arr=new int [5];for (int i = 0; i < 4; i++) {arr[i]=i;}arr[4]=100;for (int i = 0; i < arr.length; i++) {System.out.println(arr[i]);}}
}

2、删

1.Cpp

#include <iostream>
using namespace std;
#include "add.h"int main() {//初始化数组int arr[5];//5个元素为1，2，3，4,5for (int i = 0; i < 5; i++){arr[i] = i+1;}int length = sizeof(arr) / sizeof(arr[0]);//删除第二个元素arr[1]for (int i = 1; i < length; i++){arr[i] = arr[i + 1];}//最后一个元素置为-1表示已删除arr[4] = -1;for (int i = 0; i < length; i++){cout << arr[i] << " ";}system("pause");return 0;
}

2.java

public class Main {public static void main(String[] args) {//初始化数组int [] arr=new int [5];for (int i = 0; i < arr.length; i++) {arr[i]=i;}//删除第二个元素arr[1]for (int i = 1;i < arr.length -1; i++) {arr[i]=arr[i+1];}arr[arr.length-1]=-1;for (int i = 0; i < arr.length; i++) {System.out.println(arr[i]);}}
}

3、查改

1、CPP

#include <iostream>
using namespace std;
#include "add.h"int main() {//初始化数组int arr[5];//5个元素为1，2，3，4,5for (int i = 0; i < 5; i++){arr[i] = i+1;}int length = sizeof(arr) / sizeof(arr[0]);//查询arr[1]的值并改为100cout << "这里是修改前的："<<arr[1] << endl;arr[1] = 100;cout << "这里是修改后的：" << arr[1] << endl;system("pause");return 0;
}

2、java

public class Main {public static void main(String[] args) {//初始化数组int [] arr=new int [5];for (int i = 0; i < arr.length; i++) {arr[i]=i;}//查询第二个元素arr[1]并修改为100System.out.println("这里是修改前： "+ arr[1]);arr[1]=100;System.out.println("这里是修改后： "+ arr[1]);}
}