C Program to Remove All Occurrences of an Element in an Array

To remove all the occurrences of an element in an array, we will use the following 2 approaches: 

1. Using Methods
2. Without using methods or With Conditional Statement

We will keep the same input in all the mentioned approaches and get an output accordingly.

Input:

array = {1, 2, 1, 3, 1} 
value = 1 

Output:

array = {2, 3} 

Explanation: The given value 1 is to be removed from the array of elements. So, the resultant array is {2, 3} after removing the 1 from an array.

Method 1: Using functions

Approach A:

C

// C Program to remove All Occurrences of
// an element in an array using functions
#include <stdio.h>

// function declaration
int remove_element(int* array, int n, int val)
{
    int i;

    // iterates array elements
    for (i = 0; i < n; i++)

        // if the given array element is not equal to given
        // value then print array element
        if (array[i] != val)
            printf("%d ", array[i]);
}

int main()
{
    int array[6] = { 1, 2, 1, 3, 1 }, size = 5, value = 1;
    remove_element(array, size, value);
}

Output

2 3 

Approach B:

C

// C Program to remove all Occurrences of
// an element in an array using functions
#include <stdio.h>

// function declaration
int remove_element(int* array, int n, int val)
{
    int i;

    // iterating the array elements
    for (i = 0; i < n; i++) {

        // if array element is equal to the given value then
        // continue the loop else return the array element
        if (array[i] == val) {
            continue;
        }
        else {
            printf("%d ", array[i]);
        }
    }
}

int main()
{
    int array[6] = { 1, 2, 1, 3, 1 }, size = 5, value = 1;
    remove_element(array, size, value);

    return 0;
}

Output

2 3 

Method 2: Without using functions

Approach A:

C

//  C Program to remove All Occurrences
//  of an Element in an Array
#include <stdio.h>

int main()
{
    int array[6] = { 1, 2, 1, 3, 1 }, size = 5, value = 1;
    int i;

    // iterating the array elements
    for (i = 0; i < size; i++) {

        // if array element is equal to the given value then
        // continue the loop else return the array element
        if (array[i] == value) {
            continue;
        }
        else {
            printf("%d ", array[i]);
        }
    }
}

Output

2 3 

Approach B:

C

// C Program to remove all Occurrences
// of an Element in an Array
#include <stdio.h>

int main()
{
    int array[6] = { 1, 2, 1, 3, 1 }, size = 5, value = 1;
    int i;

    // iterating the array elements
    for (i = 0; i < size; i++) {

        // if array element is equal to the given value then
        // continue the loop else return the array element
        if (array[i] != value) {

            printf("%d ", array[i]);
        }
    }
}

Output

2 3