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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 ; } } }
Originally Posted by Cdre 
