Example: String Sort with qsort() in C

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// String Sort with qsort()
#include <stdio.h>
#include <string.h> // For strlen
#include <stdlib.h> // For qsort

// Step 1: Custom comparison function for characters
int compareChars(const void *a, const void *b) {
    return (*(char*)a - *(char*)b);
}

int main() {
    char str[] = "programming";
    int length = strlen(str);

    // Step 2: Call qsort function
    // Parameters:
    //   - str: Pointer to the array to be sorted
    //   - length: Number of elements in the array
    //   - sizeof(char): Size of each element
    //   - compareChars: Pointer to the comparison function
    qsort(str, length, sizeof(char), compareChars);

    // Step 3: Print the sorted string
    printf("Original string: programming\n");
    printf("Sorted string: %s\n", str);

    return 0;
}