указатель на структуру

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 5

struct adres {
    char* city;
    char* street;
    int house;
};

void viewer (struct adres *);
void cout (struct adres *);

int main () {

    struct adres a[N]= {
        "Novosibirsc", "Lenina", 10,
        "Irkutsk", "Michurina", 30 ,
        "Sanct-Peterburg", "Rechnaya", 20 ,
        "Moscov", "Lenino", 2 ,
        "Chita", "Kutuzova", 1
    };
    viewer(a);
    cout(a);
}

void viewer (struct adres *a) {
    int i;
    for (i=0; i < N; i++, a++)
    printf("%2d) city:%12s, street:%10s, house:%3d\n", i+1, a->city, a->street, a->house);
}

void cout (struct adres *a) {
    char c[15];
    int i;
    printf("enter a city: ");
    gets(c);
    for (i=0; i < N; i++)
            if (strcmp((a+i)->city,c)==0)
                printf("city:%12s\nstreet:%10s\nhouse:%3d\n", (a+i)->city, (a+i)->street, (a+i)->house);
}