//Exercise G#include #include typedef struct car car;struct car
{long arKykl;time_t xronosEis;};int main(void) {float cph =
0.0f;int choice = -1, carNum = 0, vgikan = 0, j = 0;long temp;car
inCar, outCar, lastCar;time_t synXronos = 0;FILE* allCars;if
(!(allCars = fopen("data.bin", "w+b"))) {printf("\n\nError on
opening file.\n\n");return 1;}printf("How much is the cost per
hour? ");scanf(" %f", &cph);while(choice != 3) {printf("Choose
one from below (1, 2, 3): ");printf("\n\t1. Entrance of
car");printf("\n\t2. Exit of car");printf("\n\t3. End of
program\t");scanf(" %d", &choice);while (choice < 1 ||
choice > 3)scanf(" %d", &choice);switch (choice) {case
1:carNum++;printf("\n\nPlease type the registration number:
");scanf(" %ld", &inCar.arKykl);inCar.xronosEis =
time(NULL);fseek(allCars, (vgikan) ? -vgikan*sizeof(car) : 0,
SEEK_END);fwrite(&inCar, sizeof(car), 1, allCars);if
(vgikan)vgikan--;break;case 2:printf("\n\nPlease type the
registration number: ");scanf(" %ld", &temp);fseek(allCars,
-(long)sizeof(car), SEEK_END);fread(&lastCar, sizeof(car), 1,
allCars);rewind(allCars);for (j = 0; j < carNum; j++)
{fread(&outCar, sizeof(car), 1, allCars);if (outCar.arKykl ==
temp)break;}if (j < carNum) {synXronos = time(NULL) -
outCar.xronosEis;printf("\nThe total time you have parked here is
%lf hours.\nYou pay %.2lf$.", synXronos/3600.0, synXronos/3600.0 *
cph);printf("\n\t\tThank you! :-)\n");fseek(allCars,
-(long)sizeof(car), SEEK_CUR);fwrite(&lastCar, sizeof(car), 1,
allCars);carNum--;vgikan++;}elseprintf("There is no car with
registration number %ld.\n",
temp);break;default:rewind(allCars);for (j = 0; j < carNum; j++)
{fread(&outCar, sizeof(car), 1, allCars);printf("\nCar
%d:\n\tRN: %ld\n\ttime: %lf hours\n", j+1, outCar.arKykl,
(time(NULL) -
outCar.xronosEis)/3600.0);}break;}}fclose(allCars);return 0;}
