数组的目的是通过基地址和索引，在多个内存位置上提供对相同类型数据的访问。在各种应用中，数组被用于存储各种原因的数据。数组必须像其他数据结构一样高效地处理添加、删除和更新元素。静态数组和动态数组都包含了许多在C++中处理各种与数组相关的操作的库函数。但在本文中，我们将看到如何在不使用任何库函数的情况下从数组中删除元素。
理解概念并举例说明
Given array A = [89, 12, 32, 74, 14, 69, 45, 12, 99, 85, 63, 32]
After deleting an element from index 5, the array will be like this:
A = [89, 12, 32, 74, 14, 45, 12, 99, 85, 63, 32]
从任意位置删除元素，有三种可能的情况。从任意索引的开头删除、从末尾删除、从中间删除。从末尾删除不需要任何移位。但另外两个的其余部分需要向左移动元素。首先从该位置删除一个元素，然后用连续的元素填充该位置。让我们看看算法和 C++ 代码以便清楚地理解。
算法
获取有n个元素的数组A，位置为pos
如果 pos >= n + 1, 那么
否则
结束如果
Example
的中文翻译为：示例
#include <iostream>
#include <algorithm>
# define Z 30
using namespace std;
void displayArr(int arr[], int n ) {
for( int i = 0; i < n; i++ ){
cout << arr[ i ] << ", ";
}
cout << endl;
}
void deleteElement( int A[], int &n, int pos ){
if ( pos >= n + 1 ) {
cout << "Deletion not possible" << endl;
return;
}
else
{
for ( int c = pos; c < n ; c++ ) {
A[ c ] = A[ c + 1 ];
}
n = n - 1;
}
}
int main() {
int arr[ Z ] = {84, 56, 21, 32, 74, 96, 85, 41, 21, 94, 20, 37, 36, 75, 20};
int n = 15;
cout << "Given array elements: ";
displayArr( arr, n);
cout << "Delete from last position (position 15)" << endl;
deleteElement( arr, n, 15 );
cout << "Array after deleting last element: " << endl;
displayArr( arr, n);
cout << "Delete from first position (position 0)" << endl;
deleteElement( arr, n, 0 );
cout << "Array after deleting first element: " << endl;
displayArr( arr, n);
cout << "Delete from position 7" << endl;
deleteElement( arr, n, 7 );
cout << "Array after deleting element from index 7: " << endl;
displayArr( arr, n);
}
输出
Given array elements: 84, 56, 21, 32, 74, 96, 85, 41, 21, 94, 20, 37, 36, 75, 20,
Delete from last position (position 15)
Array after deleting last element:
84, 56, 21, 32, 74, 96, 85, 41, 21, 94, 20, 37, 36, 75,
Delete from first position (position 0)
Array after deleting first element:
56, 21, 32, 74, 96, 85, 41, 21, 94, 20, 37, 36, 75,
Delete from position 7
Array after deleting element from index 7:
56, 21, 32, 74, 96, 85, 41, 94, 20, 37, 36, 75,
结论
我们在本文中展示了如何从数组中删除元素。这是一个通用过程
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