Remove Element from Array in C

In the C language, arrays are a chunk of contiguous memory space. Deleting a specified element in an array actually involves moving the subsequent elements forward to overwrite the element to be deleted. The specific steps are as follows:

1. Create a function to remove a specified element, with parameters including the array name, array length, and the value of the element to be removed.
2. Traverse the array to identify the position of the element to be deleted.
3. Move all elements after this position forward by one, overwriting the element to be deleted.
4. Reduce the length of the array by one, indicating that one element has been deleted.

Here is an example code:

#include <stdio.h>

void deleteElement(int arr[], int length, int element) {
    int i, j;
    for (i = 0; i < length; i++) {
        if (arr[i] == element) {
            // 找到要删除的元素位置
            for (j = i; j < length - 1; j++) {
                // 将后面的元素向前移动
                arr[j] = arr[j + 1];
            }
            break;
        }
    }
    length--; // 数组长度减一
}

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int length = sizeof(arr) / sizeof(arr[0]);
    int element = 3;

    deleteElement(arr, length, element);

    // 打印删除元素后的数组
    for (int i = 0; i < length - 1; i++) {
        printf("%d ", arr[i]);
    }

    return 0;
}

The code above removes element 3 from the array, and the output is: 1 2 4 5.