bin all orai

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

typedef struct {
    char name[30];
    int age;
}STUDENT;

int main ()
{
    FILE *f;
    STUDENT s;

    f=fopen("hallg.bin", "r");
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }
    while (fread(&s, sizeof(STUDENT), 1, f)>0)
        printf("%s (%d)\n", s.name, s.age);

    fseek(f, -2 * sizeof(STUDENT), SEEK_CUR); //akt. poz
    fread(&s, sizeof(STUDENT), 1, f);
    printf("%s (%d)\n", s.name, s.age);

    fseek(f, 2 * sizeof(STUDENT), SEEK_SET); //eleje
    fread(&s, sizeof(STUDENT), 1, f);
    printf("%s (%d)\n", s.name, s.age);

    fseek(f, -sizeof(STUDENT), SEEK_END); //vege
    fread(&s, sizeof(STUDENT), 1, f);
    printf("%s (%d)\n", s.name, s.age);

    fclose(f);
    return EXIT_SUCCESS;
}
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
    char name[30];
    int age;
}STUDENT;

int main ()
{
    FILE *f;
    STUDENT t[]={{"Maci Laci", 21}, {"Bena Bela", 19}, {"Teszt Elek", 20}};
    int size=sizeof(t)/sizeof(int);
    int i;

    f=fopen("hallg.bin", "w");
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }

    fwrite(t, sizeof(t), 1, f);

    fclose(f);
    return EXIT_SUCCESS;
}
*/
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main ()
{
    FILE *f;
    int t[]={-3, -2, -1, 0, 1, 2, 3, 2015};
    int size=sizeof(t)/sizeof(int);
    int i;

    f=fopen("szamok.bin", "w");
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }

    for (i=0; i<size; ++i)
        fwrite(&t[i], sizeof(int), 1, f),

    fwrite(t, sizeof(t), 1, f);

    fwrite(t, sizeof(int), size, f);

    fclose(f);
    return EXIT_SUCCESS;
}
*/
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main ()
{
    FILE *f;
    int a, b;

    f=fopen("szamok.txt", "r");
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }

    while (fscanf(f, "%d %d", &a, &b)!=EOF)
        printf("%d\n", a+b);

    fclose(f);
    return EXIT_SUCCESS;
}
*/
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main ()
{
    FILE *f;
    int ch;
    int len=0;
    int max=0;
    char *line;


    f=fopen("gyumolcs.txt", "r");
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }

    while ((ch=fgetc(f))!=EOF){
        if (ch=='\n'){
            if (max<len)
                max=len;
            len=0;
        }
        else
            ++len;
    }
    fclose(f);
    printf("%d\n", max);
    line=(char *)calloc(max+2, sizeof(char));

    f=fopen("gyumolcs.txt", "r");

    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
        }
    while(fgets(line, max+2, f)!=NULL){
        if (line[strlen(line)-1]=='\n')
            line[strlen(line)-1]='\0';
        if (strlen(line)==max)
            puts(line);
    }

    fclose(f);

    free(line);

    return EXIT_SUCCESS;
}
*/
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main ()
{
    FILE *f;
    int lines=0, ch;
    f=fopen("gyumolcs.txt", "r");
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }

    while ((ch=fgetc(f))!=EOF)
        if (ch=='\n')
            ++lines;

    fclose(f);

    printf("%d\n", lines);

    return EXIT_SUCCESS;
}
*/
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main ()
{
    FILE *f;
    char line[200];
    f=fopen("gyumolcs.txt", "w"); //C:\Users\hallgato\Documents\Prog1L
    if (f==NULL){
        fprintf(stderr, "hiba az allomany megnyitasakor!\n");
        exit(-1);
    }
    fputc('a', f);
    fputc('\n', f);

    fputs("szilva", f);
    fputc('\n', f);

    fprintf(f, "%d + %d = %d\n", 2, 3, 4 + 1);

    while (fgets(line, 200, stdin)!=NULL)
        fputs(line, f);
    fclose(f);
    return EXIT_SUCCESS;
}

*/