Taxi Rank Code #stage1

gistfile1.c

#include <stdio.h>
#define MAX_SIZE 100

void push ( int a[ ], int *top , int x);
int pop ( int a[ ], int *top);
void print ( int a[ ], int top );
int exit( );
int initialise( );

/////////////////////////////////////////

int main( )
{
    int option;
    printf("Welcome to the Taxi Rank Tracker!\n");
    
    printf("1 - Initialise\n");
    printf("2 - Taxi Leaving\n");
    printf("3 - Taxi Arriving\n");
    printf("4 - Show Current Rank\n");
    printf("\n99 - Exit\n");
    printf("\nSelect an option to continue: ");
    
    scanf("%d", &option);
    
    if(option == 1 || option == 2 || option == 3 || option == 4 || option == 99)
    {        
        if(option == 99)
        {
            exit();
            option = 0;
        }
        
        if(option == 1)
        {
            initialise();
            option = 0;
        }
        
        if(option == 2)
        {
            //something
            option = 0;
        }
        
        if(option == 3)
        {
            //something
            option = 0;
        }
        
        if(option == 4)
        {
            //print();
            option = 0;
            main();
        }
    }
    else
    {
        printf("Please enter a valid option");
        main();
    }
}
/////////////////////////////////////

/////////////////////////////////////

int initialise()
{
      int s[MAX_SIZE] ;
    int top = 0 , temp;
    int total_taxis, i;
    printf("Enter Number of Taxis (1 - 6): ");
    scanf("%d", &total_taxis);
        if (total_taxis<7 && total_taxis>0)
        {
            for(i=1; i<total_taxis+1; i++)
            {
                push( s , &top, i);
            }
        }
        else
        {
            if(total_taxis<1)
            {
                printf("Error - more than 1 taxi must be entered\n");
            }
            if(total_taxis>6)
            {
                printf("Error - maximum number of taxis is 6\n");
            }
            
            main();
        }
    
    
    print(s, top);
    temp = pop(s, &top);
    print(s, top);
    main();
}


/////////////////////////////////////

/////////////////////////////////////
void push( int a[ ], int *top , int x)
{ // do nothing if stack full.
    if ( *top < MAX_SIZE )
    {
    a[*top] = x;
    (*top)++;
    }
}
/////////////////////////////////////
    
/////////////////////////////////////
int pop( int a[ ], int *top)
{ // -1 returned if stack empty.
    if ( *top > 0 )
    {
    (*top)--;
    return(a[*top]);
    }
    else return -1;
}
////////////////////////////////////

////////////////////////////////////
void arrive()
{
    //taxi arrives
}
///////////////////////////////////

///////////////////////////////////
void depart()
{
    //taxi leaves
}
///////////////////////////////////

///////////////////////////////////
void print ( int a[ ], int top )
{
    int i ;
    if ( top > 0 )
    {
    printf("\n--------------\n");
    printf(" Number of Taxis in rank: %d\n", top);
    for (i = 0; i < top ; i++)
    printf("%6d\n", a[i] );
    }
    else printf(" Number of Taxis in rank: %d\n", top);
    printf("--------------\n\n");
}
/////////////////////////////////

/////////////////////////////////
void find()
{
    
}
/////////////////////////////////

/////////////////////////////////
int exit()
{
    int answer;
    printf("\nAre you sure you want to exit? [0 = yes / 1 = no]: ");
    scanf("%d", &answer);
    printf(answer);
    
    if(answer == 0 || answer == 1)
    {
        if(answer == 0)
        {
            printf("\nExiting ...\n");
            return 0;
        }
        if(answer == 1)
        {
            main();
        }
    }
    else
    {
        printf("\nError - you must enter 0 or 1\n");
        exit();
    }
}