Function Pointers and Callbacks with qsort in C

 Function Pointers and Callbacks with qsort in C

We discussed function pointers earlier, and here's an example that demonstrates their usage with the qsort function to sort an array of strings.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int compareStrings(const void* a, const void* b) {

    const char* str1 = *(const char**)a;

    const char* str2 = *(const char**)b;

    return strcmp(str1, str2);

}

int main() {

    char* strings[] = {"apple", "banana", "cherry", "date", "elderberry"};

    int stringCount = sizeof(strings) / sizeof(strings[0]);

    qsort(strings, stringCount, sizeof(char*), compareStrings);

    printf("Sorted strings:\n");

    for (int i = 0; i < stringCount; i++) {

        printf("%s\n", strings[i]);

    }

    return 0;

}