C - delete element from array and reorganise

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Given this array:

int a[] = {5, 8, 5, 6, 9, 5};

Would it be possible to remove all ints which equals 5 and move the rest the front of the array?

So that after the removal the array would look like this:

int a[] = {8, 6, 9, 0, 0, 0}

I don't know if by removing a element it becomes a 0 or a NULL?

Thanks!

Your array is statically allocated, so always has the same size and deleted elements have the 0 value (according how you define the deleted values).

This link can help you and explains about how to delete element from array.

C program to delete an element from an array, Deleting an element does not affect the size of the array. It also checks whether deletion is possible or not, for example, if an array contains five elements and user� Copy the next element to the current element of array. Which is you need to perform array[i] = array[i + 1]. Repeat above steps till last element of array. Finally decrement the size of array by one. Program to delete element from array

You can do it with two iterations over the array, first iteration two to turn the element you want to delete, second iteration to separate zeros from non-zeros.

    int a[] = {5, 8, 5, 6, 9, 5};
    int n = 6;
    for(int i = 0 ; i < n ; i++ ) {
        if(a[i] == 5 ) {
            a[i] = 0;
        }
    }
    int* zero = a;

    int* nonZero = a;
    int j = 0;

    while(j < n) {

        while(*zero != 0) {
            zero++;
        }       

        while(*nonZero == 0) {
            nonZero++;
            j++;
        }
        if(zero < nonZero) {
            *zero = *nonZero;
            *nonZero = 0;
        }
        j++;
    }

Reorder an array according to given indexes, Finally copy temp[] to arr[] and set all values of index[i] as i. C++; Java; Python3; C#; PHP. C++. Given this array: int a[] = {5, 8, 5, 6, 9, 5}; Would it be possible to remove all ints which equals 5 and move the rest the front of the array? So that after the removal the array would look like

It is been awhile that i have programmed in C but it is posibble.

This is just a pseudo code, but you just need to change it to way of C programming.

int a[] = {5, 8, 5, 6, 9, 5};
int b[] = {5, 8, 5, 6, 9, 5}; // copy of array a to hold temp
for(int i = 0; i < Size of array; i++ ){
  for(int j = i; j < Size of array; j++ ){
    if(b[j] != 5){
       a[i] = b[j];
       a[j] = b[i];
       break;
    }
  }
}

It will be like (▼: Target to swap, F: Finished, X: Not a targe to swap, N: Not processed):

▼, ▼, N, N, N, N

5, 8, 5, 6, 9, 5

F, ▼, X, ▼, N, N

8, 5, 5, 6, 9, 5

F, F, ▼, X, ▼, N

8, 6, 5, 5, 9, 5

Result: 8, 6, 9, 5, 5, 5

And remove 5s, it is quite different depends what you mean. If you do not change size of array then they can be 0 or undefined(null). So I think it differs by how you program the function that returns array.

Delete an element from array (Using two traversals and one , The following are the implementation of this simple approach. C/C++; Java; Python3; C#. C/C++. Program to Delete an Element from Array in C. Below is a simple program to delete an element from array, where the position of element to be deleted is given by user.

your array is not dynamic so you just can't reduce its size after its been allocated.setting the value zero might solve the problem in your case.

Deleting part of an array and reorganising, As I said, it's going to be a big array with lots of depth elements as well. I'd rather not Keep deleting, and you eventually end up with an empty array. B,E. C,F. or. A,B. C,D,. E,F. It really didn't matter what the data contained. C Program to Delete Duplicate Elements from an Array Example 1. This program to remove duplicates from array in c allows the user to enter Array Size and array elements. Next, it is going to find the duplicate elements present in this array, and delete them using For Loop.

Removing Rows or Columns from a Matrix, The easiest way to remove a row or column from a matrix is to set that row or column equal to a pair of empty square brackets [] . For example, create a 4-by-4 � C Program to Delete an Element from an Array - Deleting an element does not affect the size of array. It is also checked whether deletion is possible or not. For example if array is containing five

Array manipulation routines — NumPy v1.20.dev0 Manual, Joining arrays; Splitting arrays; Tiling arrays; Adding and removing elements; Rearranging elements Copies values from one array to another, broadcasting as necessary. Produce an object that mimics broadcasting. Remove axes of length one from a. Return a contiguous array (ndim >= 1) in memory (C order). To delete an elements from a C# array, we will shift the elements from the position the user want the element to delete. Here, first we have 5 elements − int[] arr = new int[5] {35, 50, 55, 77, 98};

array_splice - Manual, array_splice — Remove a portion of the array and replace it with something else Removes the elements designated by offset and length from the input array, and print_r($input); giving us: Array ( [a] => 1 [b] => 2 [c] => 3 [foo] => bar [e] => 5 The pop method removes the last element of the array, returns that element, and updates the length property. The pop method modifies the array on which it is invoked, This means unlike using delete the last element is removed completely and the array length reduced.

Comments
  • You can't make an int become a "null" value, it has to be an integer (and NULL is 0 on most platforms)
  • Alright, so that's 1 question answered, what about the main question?
  • The answer to the main question is: Yes. What have you tried doing? Show the code and explain what issues you have with it
  • What really happens is that you have to move down all higher elements to overwrite the value to be deleted and set the appropriate higher element to zero.
  • Possible duplicate of Remove an array element and shift the remaining ones
  • That is super inefficient in both space and time usage. Also how do you change the size of a statically sized array? That's not possible in standard C
  • As far as I remember, he did not ask for performance. Well if you are that much experienced, what about you edit/write answer for everyone! :) And true, it is impossible to change statically sized array but if you create new array with diffrent size but having only numbers without 5s yes that work. So that is matter of how you program things in my opinion. Once again, we are not focusing on high performance optimization here.
  • That is not what OP asked - nowhere in their question do they ask about reducing the size of the array