Array Functions in C

In C programming, there aren't built-in functions specifically for arrays, but rather standard library functions that can be used with arrays.

Here are some commonly used functions for array manipulation along with examples:

memcpy():

Copying Array Elements.

Copies a specified number of bytes from the source array to the destination array.

Example:

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

int main() {
    int source[] = {1, 2, 3, 4, 5};
    int destination[5];

    // Copying elements from source array to destination array
    memcpy(destination, source, sizeof(source));

    // Printing the destination array
    for (int i = 0; i < 5; i++) {
        printf("%d ", destination[i]);
    }
    printf("\n");

    return 0;
}

memset():

Filling Array Elements:

Example:

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

int main() {
    int arr[5];

    // Filling the array with 0
    memset(arr, 0, sizeof(arr));

    // Printing the array
    for (int i = 0; i < 5; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}

Sets the first n bytes of the memory area pointed to by the destination to the specified value.

memcmp():

Example:

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

int main() {
    int arr1[] = {1, 2, 3, 4, 5};
    int arr2[] = {1, 2, 3, 4, 6};

    // Comparing arrays
    int result = memcmp(arr1, arr2, sizeof(arr1));

    if (result == 0) {
        printf("Arrays are equal.\n");
    } else {
        printf("Arrays are not equal.\n");
    }

    return 0;
}

Comparing Array Contents.

Compares the first n bytes of two memory blocks.

Example:

#include <stdio.h>
#include <stdlib.h>

// Comparison function for qsort
int compare(const void *a, const void *b) {
    return (*(int *)a - *(int *)b);
}

int main() {
    int arr[] = {3, 1, 4, 1, 5, 9, 2, 6, 5, 3};

    // Sorting the array
    qsort(arr, sizeof(arr) / sizeof(arr[0]), sizeof(arr[0]), compare);

    // Printing the sorted array
    for (int i = 0; i < sizeof(arr) / sizeof(arr[0]); i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}

qsort():

Sorting Array Elements.

Example:

#include <stdio.h>
#include <stdlib.h>

// Comparison function for bsearch
int compare(const void *a, const void *b) {
    return (*(int *)a - *(int *)b);
}

int main() {
    int arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    int key = 5;

    // Searching for key in the array
    int *result = (int *)bsearch(&key, arr, sizeof(arr) / sizeof(arr[0]), sizeof(arr[0]), compare);

    if (result != NULL) {
        printf("Key found at index: %d\n", (int)(result - arr));
    } else {
        printf("Key not found.\n");
    }

    return 0;
}

Sorts the elements of an array in ascending order using the quicksort algorithm.

bsearch():

Searching Array Elements:

Searches for a key in a sorted array using binary search.

Note:

These are some commonly used functions for array manipulation in C programming.

By using these functions effectively, we can perform various operations on arrays efficiently.

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