Vehicle parking program

/* Vehicle parking program */

Program Statement:

You are required to model a vehicle parking lot system. The parking lot has a facility to park cars and scooters. The parking lot contains four parking lanes-two for cars and two for scooters.

Each lane can hold ten vehicles. There is an operator with a console at the East end of the parking lot. The system should be able to handle following scenarios.

Arrival of a vehicle:

1. Type of vehicle (car or scooter) and Registration No. of vehicle should be entered
2. Program should display suitable parking slot
3. Vehicles arrive at East end, leave from West end

Departure of Car:

1. If not western most, all cars should be moved to the west
2. When the car is driven out, rest of the cars should be moved to the left
3. Vehicle data should be updated

Departure of Scooter:

1. Scooters should be able to drive out at random
2. Vehicle data should be updated

Note that when desired the operator must be able to obtain information like number of vehicles, number of scooters or number of cars currently parked in the parking lot. Also, the system should be able to display all the parking lots (currently occupied) if desired.

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

#define CAR 1
#define SCOOTER 2

/* to store vehicle number, and its
row-col position in an array */
struct vehicle
{
int num ;
int row ;
int col ;
int type ;
} ;

int parkinfo[4][10] ; /* a 2-D array to store number of vehicle parked */
int vehcount ; /* to store total count of vehicles */
int carcount ; /* stores total count of cars */
int scootercount ; /* stores total count of scooters */

void display( ) ;
void changecol ( struct vehicle * ) ;
struct vehicle * add ( int, int, int, int ) ;
void del ( struct vehicle * ) ;
void getfreerowcol ( int, int * ) ;
void getrcbyinfo ( int, int, int * ) ;
void show( ) ;

/* decrements the col. number by one
this fun. is called when the data is
shifted one place to left */
void changecol ( struct vehicle *v )
{
v -> col = v -> col - 1 ;
}

/* adds a data of vehicle */
struct vehicle * add ( int t, int num, int row, int col )
{
struct vehicle *v ;

v = ( struct vehicle * ) malloc ( sizeof ( struct vehicle ) ) ;

v -> type = t ;
v -> row = row ;
v -> col = col ;

if ( t == CAR )
carcount++ ;
else
scootercount++ ;

vehcount++ ;
parkinfo[row][col] = num ;

return v ;
}

/* deletes the data of the specified
car from the array, if found */
void del ( struct vehicle *v )
{
int c ;

for ( c = v -> col ; c < 9 ; c++ )
parkinfo[v -> row][c] = parkinfo[v -> row][c+1] ;

parkinfo[v -> row][c] = 0 ;

if ( v -> type == CAR )
carcount-- ;
else
scootercount-- ;

vehcount-- ;
}

/* get the row-col position for the vehicle to be parked */
void getfreerowcol ( int type, int *arr )
{
int r, c, fromrow = 0, torow = 2 ;

if ( type == SCOOTER )
{
fromrow += 2 ;
torow += 2 ;
}

for ( r = fromrow ; r < torow ; r++ )
{
for ( c = 0 ; c < 10 ; c++ )
{
if ( parkinfo[r][c] == 0 )
{
arr[0] = r ;
arr[1] = c ;
return ;
}
}
}

if ( r == 2 || r == 4 )
{
arr[0] = -1 ;
arr[1] = -1 ;
}
}

/* get the row-col position for the vehicle with specified number */
void getrcbyinfo ( int type, int num, int *arr )
{
int r, c, fromrow = 0, torow = 2 ;

if ( type == SCOOTER )
{
fromrow += 2 ;
torow += 2 ;
}

for ( r = fromrow ; r < torow ; r++ )
{
for ( c = 0 ; c < 10 ; c++ )
{
if ( parkinfo[r][c] == num )
{
arr[0] = r ;
arr[1] = c ;
return ;
}
}
}

if ( r == 2 || r == 4 )
{
arr[0] = -1 ;
arr[1] = -1 ;
}
}

/* displays list of vehicles parked */
void display( )
{
int r, c ;

printf ( "Cars ->\n" ) ;

for ( r = 0 ; r < 4 ; r++ )
{
if ( r == 2 )
printf ( "Scooters ->\n" ) ;

for ( c = 0 ; c < 10 ; c++ )
printf ( "%d\t", parkinfo[r][c] ) ;
printf ( "\n" ) ;
}
}

void main( )
{
int choice, type, number, row = 0, col = 0 ;
int i, tarr[2] ;
int finish = 1 ;
struct vehicle *v ;

/* creates a 2-D array of car and scooter class */
struct vehicle *car[2][10] ;
struct vehicle *scooter[2][10] ;

clrscr( ) ;

/* displays menu and calls corresponding functions */
while ( finish )
{
clrscr( ) ;

printf ( "\nCar Parking\n" ) ;
printf ( "1. Arrival of a vehicle\n" ) ;
printf ( "2. Total no. of vehicles parked\n" ) ;
printf ( "3. Total no. of cars parked\n" ) ;
printf ( "4. Total no. of scooters parked\n" ) ;
printf ( "5. Display order in which vehicles are parked\n" ) ;
printf ( "6. Departure of vehicle\n" ) ;
printf ( "7. Exit\n" ) ;
scanf ( "%d", &choice ) ;

switch ( choice )
{
case 1 :

clrscr( ) ;
printf ( "\nAdd: \n" ) ;

type = 0 ;

/* check for vehicle type */
while ( type != CAR && type != SCOOTER )
{
printf ( "Enter vehicle type (1 for Car / 2 for Scooter ): \n" ) ;
scanf ( "%d", &type ) ;
if ( type != CAR && type != SCOOTER )
printf ( "\nInvalid vehicle type.\n" ) ;
}

printf ( "Enter vehicle number: " ) ;
scanf ( "%d", &number ) ;

/* add cars' data */
if ( type == CAR || type == SCOOTER )
{
getfreerowcol ( type, tarr ) ;

if ( tarr[0] != -1 && tarr[1] != -1 )
{
row = tarr[0] ;
col = tarr[1] ;

if ( type == CAR )
car[row][col] = add ( type, number, row, col ) ;
else
scooter[row - 2][col] = add ( type, number, row, col ) ; ;
}
else
{
if ( type == CAR )
printf ( "\nNo parking slot free to park a car\n" ) ;
else
printf ( "\nNo parking slot free to park a scooter\n" ) ;
}
}
else
{
printf ( "Invalid type\n" ) ;
break ;
}

printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;

case 2 :

clrscr( ) ;
printf ( "Total vehicles parked: %d\n", vehcount ) ;
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;

case 3 :

clrscr( ) ;
printf ( "Total cars parked: %d\n", carcount ) ;

printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;

case 4 :

clrscr( ) ;
printf ( "Total scooters parked: %d\n", scootercount ) ;
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;

case 5 :

clrscr( ) ;
printf ( "Display\n" ) ;
display( ) ;

printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;

case 6 :

clrscr( ) ;
printf ( "Departure\n" ) ;

type = 0 ;

/* check for vehicle type */
while ( type != CAR && type != SCOOTER )
{
printf ( "Enter vehicle type (1 for Car / 2 for Scooter ): \n" ) ;
scanf ( "%d", &type ) ;
if ( type != CAR && type != SCOOTER )
printf ( "\nInvalid vehicle type.\n" ) ;
}
printf ( "Enter number: " ) ;
scanf ( "%d", &number ) ;

if ( type == CAR || type == SCOOTER )
{
getrcbyinfo ( type, number, tarr ) ;
if ( tarr[0] != -1 && tarr[1] != -1 )
{
col = tarr [1] ;

/* if the vehicle is car */
if ( type == CAR )
{
row = tarr [0] ;
del ( car [row][col] ) ;
for ( i = col ; i < 9 ; i++ )
{
car[row][i] = car[row][i + 1] ;
changecol ( car[row][i] ) ;
}
free ( car[row][i] ) ;
car[row][i] = NULL ;
}
/* if a vehicle is scooter */
else
{
row = tarr[0] - 2 ;
if ( ! ( row < 0 ) )
{
del ( scooter[row][col] ) ;
for ( i = col ; i < 9 ; i++ )
{
scooter[row][i] = scooter[row][i + 1] ;
changecol ( scooter[row][col] ) ;
}
scooter[row][i] = NULL ;
}
}
}
else
{
if ( type == CAR )
printf ( "\nInvalid car number, or a car with such number has not been parked here.\n" ) ;
else
printf ( "\nInvalid scooter number, or a scooter with such number has not been parked here.\n" ) ;
}
}

printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;

case 7 :

clrscr( ) ;
for ( row = 0 ; row < 2 ; row++ )
{
for ( col = 0 ; col < 10 ; col++ )
{
if ( car[row][col] -> num != 0 )
free ( car[row][col] ) ;
if ( scooter[row][col] -> num != 0 )
free ( scooter[row+2][col] ) ;
}
}
finish = 0 ;
break ;
}
}
}