Please help with these errors

Code:

#include <stdio.h>
#include<stdlib.h>

#define MAX 6


int add (int t_array[], int f, int r, int max, int added_t);


int main()

{
    int taxi_array[MAX];
	int menu = 0;
	int front = -1;
    int rear = -1;
	int addedTaxi;

// Loop for Menu
while ( menu <= 8 )
{

return 0;


//Menu for User
printf("-------------------------------\n");
printf("Please Select an option from the menu.\n");
	printf("1. arrive:	Add a taxi to the rear of the queue.\n");
printf("-------------------------------\n");
scanf_s("%d",&menu);				
	


switch (menu)                  // Menu System for the Taxi Queue
    {
    case 1:
		                            //Enter Taxi Registration Number to the Queue 		
		add(taxi_array, front, rear, MAX, addedTaxi);             
        break;
    
	default:
		
		break;
    }
}
}


    int add(int taxi_array[], int front, int rear, int MAX, int addedTaxi)
    {
	if (rear==MAX-1)
	{
    printf("Taxi Rank Full\n");
	}
	else (front==-1) //If queue is initially empty
            {
    front=0;
	printf("Input the reg of the new taxi\n");
	scanf_s("%d", addedTaxi);
	rear=rear+1;
	taxi_array[rear] = addedTaxi;
	prinf("The follow taxi has joined the queue: %s \n", addedTaxi);
	}
    }//End of add

Errors:

(50) : error C2143: syntax error : missing ')' before 'constant'
(50) : error C2143: syntax error : missing '{' before 'constant'
(50) : error C2059: syntax error : '<Unknown>'
(50) : error C2059: syntax error : ')'

 

Code:

int add(int taxi_array[], int front, int rear, int [COLOR="Red"]max[/COLOR], int addedTaxi)

Code:

else [COLOR="red"]if[/COLOR] (front==-1)

 

Code:

#include <stdio.h>
#include<stdlib.h>

#define [B][COLOR="Red"]MAX[/COLOR][/B] 6


//int add (int t_array[], int f, int r, [B][COLOR="red"]int max[/COLOR][/B], int added_t);

[COLOR="red"]//no need to pass max, since u pass MAX which is global
int add (int t_array[], int f, int r, int added_t); [/COLOR]



int main()
{
    int taxi_array[MAX];
    int menu = 0;
    int front = -1;
    int rear = -1;
    int addedTaxi;

    // Loop for Menu
    while ( menu <= 8 )
    {
         //bellow line will exit the program
         //return 0;

         //Menu for User
         printf("-------------------------------\n");
         printf("Please Select an option from the menu.\n");
         printf("1. arrive:	Add a taxi to the rear of the queue.\n");
         printf("-------------------------------\n");
         scanf_s("%d",&menu);				
	
         switch (menu)                  // Menu System for the Taxi Queue
         {
              case 1:
	    //Enter Taxi Registration Number to the Queue 		
	    //add(taxi_array, front, rear, [COLOR="red"]MAX,[/COLOR] addedTaxi);             
                add(taxi_array, front, rear, addedTaxi);             

                 break;
    
	default:
	    break;
        }
    }

    [COLOR="red"]return 0;[/COLOR]
}


//int add(int taxi_array[], int front, int rear, [COLOR="red"]int MAX[/COLOR], int addedTaxi)
int add(int taxi_array[], int front, int rear, int addedTaxi)
{
    if (rear==MAX-1)
    {
        printf("Taxi Rank Full\n");
    }
    else if(front==-1) //If queue is initially empty
    {
        front=0;
        printf("Input the reg of the new taxi\n");
        scanf_s("%d", addedTaxi);
        rear=rear+1;
        taxi_array[rear] = addedTaxi;
        prinf("The follow taxi has joined the queue: %s \n", addedTaxi);
    }

[COLOR="red"]    return 0; //return some value[/COLOR]
}//End of add