How to Remove Element from Array based on a Condition in C

How to Remove Element from Array based on a Condition in C ?

Answer

In C, you can iterate through the array and move elements to fill the gaps created by removing elements based on a condition.

✐ Examples

1 Remove Even Numbers

In this example,

We create an array `numbers` with elements including those to be removed based on the condition.
We iterate through the array and shift elements to overwrite even numbers.
We decrement the count of elements to simulate removal of even numbers.

C Program

#include <stdio.h>

int main() {
    int numbers[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    int length = sizeof(numbers) / sizeof(numbers[0]);
    int i, count = 0;

    for (i = 0; i < length; i++) {
        if (numbers[i] % 2 != 0) {
            numbers[count++] = numbers[i];
        }
    }

    printf("Array after filtering:\n");
    for (i = 0; i < count; i++) {
        printf("%d ", numbers[i]);
    }
    return 0;
}

Output

Array after filtering:
1 3 5 7 9

2 Remove Strings Containing 'a'

In this example,

We create an array `words` with elements including those to be removed based on the condition.
We iterate through the array and move elements to overwrite strings containing 'a'.
We decrement the count of elements to simulate removal of strings containing 'a'.

C Program

#include <stdio.h>
#include <string.h>

int main() {
    char words[][10] = {"apple", "banana", "grape", "orange", "melon"};
    int length = sizeof(words) / sizeof(words[0]);
    int i, count = 0;

    for (i = 0; i < length; i++) {
        if (!strchr(words[i], 'a')) {
            strcpy(words[count++], words[i]);
        }
    }

    printf("Array after filtering:\n");
    for (i = 0; i < count; i++) {
        printf("%s ", words[i]);
    }
    return 0;
}

Output

Array after filtering:
melon

Summary

In this tutorial, we learned How to Remove Element from Array based on a Condition in C language with well detailed examples.

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How to Remove Element from Array based on a Condition in C

How to Remove Element from Array based on a Condition in C ?

Answer

✐ Examples

1 Remove Even Numbers

C Program

Output

2 Remove Strings Containing 'a'

C Program

Output

Summary

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