Hi.. ive been working on a code for the past week now and ive stumbled upon a problem.....the code is about a Vehicle Parking System where u enter cars give them spaces and then remove them when exiting....just like a parking system...however the problem i have is in Exiting... after i try to exit a vehicle the program crashes..can someone give me some assistance on how to correct this problem plzzz........i use the Codeblock program to write it if tht helps
Code:#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#define CAR 1 //NORMAL CARS
#define CAR2 2 //RESERVED CARS ONLY
/* 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 car2count ; /* stores total count of car2 */void display( ) ;
void changecol ( struct vehicle * ) ;
struct vehicle * add ( int, int, int, int ) ;
void del ( struct vehicle *v ) ;
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
car2count++ ;
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
car2count-- ;
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 == CAR2 )
{
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 == CAR2 )
{
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 ( "Car2 ->\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 car2 class */struct vehicle *car[2][10] ;
struct vehicle *car2[2][10] ;
/* displays menu and calls corresponding functions */while ( finish )
{
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 car2 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 :
printf ( "\nAdd: \n" ) ;
type = 0 ;
/* check for vehicle type */while ( type != CAR && type != CAR2 )
{
printf ( "Enter vehicle type (1 for Car / 2 for Car2 ): \n" ) ;
scanf ( "%d", &type ) ;
if ( type != CAR && type != CAR2 )
printf ( "\nInvalid vehicle type.\n" ) ;
}
printf ( "Enter vehicle licence number: " ) ;
scanf ( "%d", &number ) ;
/* add cars' data */if ( type == CAR || type == CAR2 )
{
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
car2[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 car2\n" ) ;
}
}
else
{
printf ( "Invalid type\n" ) ;
break ;
}
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;
case 2 :
printf ( "Total vehicles parked: %d\n", vehcount ) ;
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;
case 3 :
printf ( "Total cars parked: %d\n", carcount ) ;
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;
case 4 :
printf ( "Total car2 parked: %d\n", car2count ) ;
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;
case 5 :
printf ( "Display\n" ) ;
display( ) ;
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;
case 6 :
printf ( "Departure\n" ) ;
type = 0 ;
/* check for vehicle type */while ( type != CAR && type != CAR2 )
{
printf ( "Enter vehicle type (1 for Car / 2 for Car2 ): \n" ) ;
scanf ( "%d", &type ) ;
if ( type != CAR && type != CAR2 )
printf ( "\nInvalid vehicle type.\n" ) ;
}
printf ( "Enter vehicle licence number: " ) ;
scanf ( "%d", &number ) ;
if ( type == CAR || type == CAR2 )
{
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 car2 */else
{
row = tarr[0] - 2 ;
if ( ! ( row < 0 ) )
{
del ( car2[row][col] ) ;
for ( i = col ; i < 9 ; i++ )
{
car2[row][i] = car2[row][i + 1] ;
changecol ( car2[row][col] ) ;
}
car2[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 car2 number, or a car2 with such number has not been parked here.\n" ) ;
}
}
printf ( "\nPress any key to continue..." ) ;
getch( ) ;
break ;
case 7 :
for ( row = 0 ; row < 2 ; row++ )
{
for ( col = 0 ; col < 10 ; col++ )
{
if ( car[row][col] -> num != 0 )
free ( car[row][col] ) ;
if ( car2[row][col] -> num != 0 )
free ( car2[row+2][col] ) ;
}
}
finish = 0 ;
break ;
}
}
}
