How to Filter Elements of an Array based on a Condition in C

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How to Filter Elements of an Array based on a Condition in C ?

Answer

To filter elements of an array based on a condition in C, you can use loops along with conditional statements.

✐ Examples

1 Filter Even Numbers

In this example,

We have an array named numbers containing integers.
We iterate through the array using a loop.
Within the loop, we use an if statement to check if each number is even.
If the number is even, we add it to a new array named evenNumbers.
We print the filtered array to demonstrate the filtering.

C Program

#include <stdio.h>
int main() {
    int numbers[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    int evenNumbers[10];
    int evenIndex = 0;
    for (int i = 0; i < 10; i++) {
        if (numbers[i] % 2 == 0) {
            evenNumbers[evenIndex++] = numbers[i];
        }
    }
    printf("Even Numbers: ");
    for (int i = 0; i < evenIndex; i++) {
        printf("%d ", evenNumbers[i]);
    }
    return 0;
}

Output

Even Numbers: 2 4 6 8 10

2 Filter Strings by Length

In this example,

We have an array named words containing strings.
We iterate through the array using a loop.
Within the loop, we use an if statement to check if each string's length meets the condition.
If the condition is met, we add the string to a new array named filteredWords.
We print the filtered array to demonstrate the filtering.

C Program

#include <stdio.h>
#include <string.h>
int main() {
    char *words[] = {"apple", "banana", "cherry", "date", "fig"};
    char *filteredWords[5];
    int filteredIndex = 0;
    for (int i = 0; i < 5; i++) {
        if (strlen(words[i]) > 5) {
            filteredWords[filteredIndex++] = words[i];
        }
    }
    printf("Filtered Words: ");
    for (int i = 0; i < filteredIndex; i++) {
        printf("%s ", filteredWords[i]);
    }
    return 0;
}

Output

Filtered Words: banana cherry

Summary

In this tutorial, we learned How to Filter Elements of an Array based on a Condition in C language with well detailed examples.

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How to Filter Elements of an Array based on a Condition in C

How to Filter Elements of an Array based on a Condition in C ?

Answer

✐ Examples

1 Filter Even Numbers

C Program

Output

2 Filter Strings by Length

C Program

Output

Summary

More C Arrays Tutorials