#include <stdio.h>
#include <stdlib.h>
struct student
{
char nazwisko[30];
char imie[20];
int numer;
double oceny[5];
double sr;
};
void dopisz();
void drukuj(struct student);
void drukuj_plik();
struct student srednia(struct student);
main()
{
int znak;
while(1)
{
printf("\tMenu\n");
printf("d - dopisz element\n");
printf("w - drukuj plik\n");
printf("q - wyjdz\n");
znak = getchar();
switch (znak)
{
case 'd' : dopisz();
break;
case 'w' : drukuj_plik();
break;
case 'q' : return 0;
default : printf("Bledny znak!\n");
}
fflush(stdin);
}
}
void dopisz()
{
FILE *plik;
struct student add;
int i;
plik = fopen("dane.bin","ab");
if (plik == NULL) printf("Plik nie istnieje\n");
else
{
printf("Podaj nazwisko\n"); fflush(stdin); scanf("%29s", add.nazwisko);
printf("Podaj imie\n"); fflush(stdin); scanf("%19s", add.imie);
printf("Podaj numer\n"); fflush(stdin); scanf("%d", &add.numer);
printf("Podaj oceny [5]\n");
for(i=0; i<5; i++)
{
fflush(stdin);
scanf("%lg", &add.oceny[i]);
printf("%g\n", add.oceny[i]);
}
add=srednia(add);
fwrite(&add, sizeof(struct student), 1, plik);
fclose(plik);
}
}
void drukuj(struct student print)
{
int i;
printf("Nazwisko:\t%s\n", print.nazwisko);
printf("Imie:\t\t%s\n", print.imie);
printf("Numer:\t\t%d\n", print.numer);
printf("Oceny:\t\t");
for (i=0; i<5; i++) printf("%g, ", print.oceny[i]);
printf("\nSrednia:\t%g\n",print.sr);
}
void drukuj_plik()
{
int i=1;
struct student druk;
FILE *plik;
plik = fopen("dane.bin", "rb");
if (plik == NULL) printf("Plik nie istnieje\n");
else
{
while(feof(plik)==0)
{
fseek(plik, (i-1)*sizeof(struct student), SEEK_SET);
fread(&druk, sizeof(struct student), 1, plik);
drukuj(druk);
i++;
}
fclose(plik);
}
}
struct student srednia(struct student sred)
{
int i;
double s=0;
for(i=0; i<5; i++) s+=sred.oceny[i];
sred.sr=s/5;
return sred;
}
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