OCT 2015 ICT 5101 Assignment 1014311039

1014311039.c

/**
---------------------------------------------------------------------------------------------------------
Student Name: Md Sirajus Salayhin
Student ID: 1014311039
Email: salayhin@gmail.com
---------------------------------------------------------------------------------------------------------
OCT 2015 ICT 5101 Assignment 1014311039
---------------------------------------------------------------------------------------------------------
Problem Statement (Bus Terminal):

You have to implement a bus terminal system. First, there will be 4 options to choose.
1 for printing all available buses in the terminal,
2 for a new bus entry in the terminal (if there is empty place),
3 for exiting the first bus in the queue and
4 for exiting the program.

There are only 5 places in the bus stand and bus number would be from 1 to 30.
You have to print mesage after each successful entry or exit.
You also have to print appropriate message each unsuccessful event or unusual condition.
---------------------------------------------------------------------------------------------------------

*/

#include <stdio.h>
#define MAX 5

/* Initialization */
int rear  = -1;
int front = -1;
int busTerminal[MAX];

/* Function for print terminal and bus status */
void printBusStatus(){
	int i;

    if(front == -1)
      printf("\n \tThere is no bus in Terminal.");
    else
    {
      printf("\n \tAvailable buses in the terminal\n ");

      for(i = front; i <= rear; i++)
      {
        printf("\t %d", busTerminal[i]);
      }
    }
}

/* Function for enter new bus to the terminal*/
void enterBus(){

    int num, i, j, k;
	int flag = 0;

    printf("\n \tWhich bus you want to enter to the terminal?: ");
    scanf("%d", &num);

	if(front != -1){
	   for(i = front; i<= rear; i++)
		  {
			  if(busTerminal[i] == num){
				flag = 1;
				break;
			  }
		  }
	}

   if(num <1 || num >30){
        printf("\n \tBus number is invalid.");
        printf("\n \tPlease enter valid bus number. Valid bus number are 1-30");
   }else if(flag == 1){
        printf("\n \tBus is already in the terminal");
	}
   else if(front == 0 && rear == MAX-1){
        printf("\n \tNo empty space in the terminal");
	}
   else if(front == -1 && rear == -1)
   {
      front = rear = 0;
      busTerminal[rear] = num;
   }
   else if(rear == MAX-1 && front !=0)
   {
       k = front;
	   for(j=0; j<= rear-front; j++){
		   busTerminal[j] = busTerminal[k];
           k++;
	   }

       rear = rear - front + 1;
       front = 0;
       busTerminal[rear] = num;
   }
   else
   {
      rear++;
      busTerminal[rear] = num;
   }
}


/* Function for exit bus from terminal */
void exitBus(){
	int bus;

	if(front == -1)
	{
      printf("\n \tNo bus in the terminal.");
	}
      else{
      bus = busTerminal[front];

      front++;
       printf("\n \tBus number %d left the terminal.",bus);
	}
	if(front == rear)
     front = rear = -1;
    else
	{
	if(front == MAX-1)
      front = 0;
    }
}


/** Main function of the program **/
void main(){

	printf("Bus Terminal:");

	while(1){
        printf("\n\n\n1. Print available buses in the terminal");
        printf("\n2. New bus entry in the terminal");
        printf("\n3. Exit the first bus in the queue");
        printf("\n4. Exit the program");
        printf("\n\n\tChoose a Number for desired operation: ");

		int option;
		scanf("%d", &option);

		switch(option){
			case 1:
				printBusStatus();
				break;
			case 2:
				enterBus();
				break;
			case 3:
				exitBus();
				break;
			case 4:
				printf("\n \tThank you for using this program");

				return 0;
			default:
				printf("\n \tOoOpSs!!! Invalid choice, please choice from 1 to 4.");
		}
	}
}