Example: Basic qsort for integers in C

C
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C#
Java
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// Basic qsort for integers
#include <stdio.h>
#include <stdlib.h> // For qsort

// Comparison function for integers (ascending)
int compareIntegers(const void *a, const void *b) {
    int int_a = *(const int *)a;
    int int_b = *(const int *)b;
    return int_a - int_b;
}

int main() {
    int arr[] = {5, 2, 8, 1, 9, 3};
    int n = sizeof(arr) / sizeof(arr[0]);

    printf("Original array: ");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    // Sort the array using qsort and the custom comparison function
    qsort(arr, n, sizeof(int), compareIntegers);

    printf("Sorted array (ascending): ");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}