How to Use bsearch with an Array of Struct in C?

// C Program to illustrate how to use bsearch with a
// structure
#include <stdio.h>
#include <stdlib.h>

// Define the Person struct
struct Person {
    int id;
    char name[50];
};

// Comparison function for bsearch
int comparePersons(const void* a, const void* b)
{
    // Convert the void pointers to Person pointers
    int idA = ((struct Person*)a)->id;
    int idB = ((struct Person*)b)->id;

    // Compare the IDs for sorting
    return (idA - idB);
}

int main()
{
    // Array of Person structs (assumed to be sorted by id)
    struct Person people[] = {
        { 1, "Ram" },
        { 2, "Rohan" },
        { 4, "Ria" },
        { 3, "Mohan" },
    };

    // Calculate the number of elements in the array
    int n = sizeof(people) / sizeof(people[0]);

    // Sort the array before using bsearch
    qsort(people, n, sizeof(struct Person), comparePersons);

    // Define the key to search for
    struct Person keyPerson = {
        .id = 3, .name = ""
    }; // Using designated initializer for clarity

    // Use bsearch to find the person with the specified ID
    struct Person* result = (struct Person*)bsearch(
        &keyPerson, people, n, sizeof(struct Person),
        comparePersons);

    // Check if the person was found
    if (result != NULL) {
        printf("Person found: ID=%d, Name=%s\n", result->id,
               result->name);
    }
    else {
        printf("Person not found.\n");
    }

    return 0;
}