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

struct recenica
{
    char rec[30];
};

main()
{
    int i, n = 0;
    struct recenica r;
    FILE * fp;

    fp = fopen("rec.txt", "w");

    if (fp == NULL)
    {
        printf("Greska pri otvaranju datoteke.");
        exit(1);
    }

    printf("Upisi neku recenicu: ");
    gets(r.rec);

    fwrite(&r, sizeof(struct recenica), 1, fp);
    fclose(fp);

    fp = fopen("rec.txt", "r");

    fread(&r, sizeof(struct recenica), 1, fp);

    for (i = 0; i < 30; i++)
    {
        if (r.rec[i] != '\0')
        {
            n++;
        }
        else
        {
            break;
        }
    }

    printf("\nRecenica ima %d znakova.", n);

    fclose(fp);

    getch();
}