c_uni.c

#include <iostream>
#include <windows.h>
#include <stdio.h>

typedef struct person {
    char *firstName;
    char *lastName;
    int yearOfBirthday;
    char *job;
} PERSON;

PERSON *make_person(const char *firstName, const char *lastName, const int yearOfBirth, const char *job) {
    PERSON *person = (PERSON *) malloc(sizeof(PERSON));

    person->firstName = (char *) firstName;
    person->lastName = (char *) lastName;
    person->job = (char *) job;
    person->yearOfBirthday = yearOfBirth;

    return person;
}

void free_person(PERSON *person) {
    free(person);
}

void print_person(PERSON *person) {
    printf("FirstName: %s, LastName: %s, Job: %s, Year of Birth: %d\n",
           person->firstName,
           person->lastName,
           person->job,
           person->yearOfBirthday
    );
}

int cmpfunc(const void *a, const void *b) {
    return (*(int *) a - *(int *) b);
}

int cstring_cmp(const void *a, const void *b) {
    const char **ia = (const char **) a;
    const char **ib = (const char **) b;
    return strcmp(*ia, *ib);
}

int main() {
    int values[] = {22, 23, 454, 1, 2, 3};
    qsort(values, 6, sizeof(int), cmpfunc);

    char *strings[] = {"Zorro", "Alex", "Celine", "Bill", "Forest", "Dexter"};
    qsort(strings, sizeof(strings) / sizeof(char *), sizeof(char *), cstring_cmp);

    PERSON *christian = make_person("Christian", "Bergau", 1986, "Software Architect");
    PERSON *christina = make_person("Christina", "WeissIchNicht", 1989, "Studentin");

    print_person(christian);
    print_person(christina);

    free_person(christian);
    free_person(christina);

    return (0);
}