lab11.c

#include <stdio.h>
#include <stdlib.h>

struct person {
  char given_name[20];
  char surname[20];
  unsigned int age;
  long unsigned pesel;
};

void print_person(struct person * ptr) {
  printf("Name: %s %s\n", ptr - > given_name, ptr - > surname);
  printf("Age: %i\n", ptr - > age);
  printf("PESEL number: %lu\n", ptr - > pesel);
}

void read_person(struct person * ptr) {
  scanf("%s", ptr - > given_name);
  scanf("%s", ptr - > surname);
  scanf("%i", & ptr - > age);
  scanf("%i", & ptr - > pesel);

}

struct person * find_person(struct person * ppl, int ppl_len, char * surname) {
    int i;
    for (i = 0; i
      if (strcmp(ppl[i].surname, surname) == 0)
        return &ppl[i];
      return NULL;
    };

    int main() {
        struct person * ppl;
        int ppl_len;

        scanf("%i", & ppl_len);

        ppl = calloc(ppl_len, sizeof(struct person));

        int i;
        for (i = 0; i read_person( & ppl[i]);

          for (i = 0; i print_person( & ppl[i]);

            printf("search by surname: \n"); char * query; scanf("%s", query);

            struct person * result = find_person(ppl, ppl_len, query);
            if (result != NULL)
              print_person(result);
            else
              printf("not found");

            free(ppl);

            return EXIT_SUCCESS;
          }