#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>


#define SIZE 4 // Define Number of Employees "SIZE" to be 2



struct employee// Declare Struct Employee
{
	int num;
	int age;
	double salary;
};


/* main program */
int main(void) {

	int option = 0; //inititialize ints
	int NumOfEmp = 0;//inititialize ints
	int i = 0;//inititialize ints
	int idToUpdate = 0;
	int end = 0;
	int end2 = 0;
	printf("---=== EMPLOYEE DATA ===---\n\n"); //print title to screen

	struct employee emp[SIZE];// Declare a struct Employee array "emp" with SIZE elements and initialize all elements to zero

	do {
		// Print the option list
		printf("1. Display Employee Information\n");
		printf("2. Add Employee\n");
		printf("3. Update Employee Salary\n");
		printf("4. Remove Employee\n");
		printf("0. Exit\n\n");
		printf("Please select from the above options: ");


		// Capture input to option variable
		scanf("%d", &option);
		printf("\n");

		switch (option) {
		case 0: // Exit the program
			printf("Exiting Employee Data Program. Good Bye!!!\n"); //printing exit message
			break;
		case 1: // Display Employee Data
				// @IN-LAB

			printf("EMP ID  EMP AGE EMP SALARY\n"); // printing title
			printf("======  ======= ==========\n");

			for (i = 0; i < SIZE; i++) //iterate for all spots in array
			{
				if (emp[i].num > 0) { // checking if data is valid
					printf("%6d%9d%11.2lf\n", emp[i].num, emp[i].age, emp[i].salary); // Use "%6d%9d%11.2lf" formatting in a printf statement to display employee id, age and salary
				}

			}
			printf("\n");


			break;
		case 2: // Adding Employee
				// @IN-LAB

			printf("Adding Employee\n"); //print title
			printf("===============\n");

			if (NumOfEmp < (SIZE)) { // Check for limits on the array
				printf("Enter Employee ID: "); // add data accordingly
				scanf("%d", &emp[NumOfEmp].num);

				printf("Enter Employee Age: "); // add data accordingly
				scanf("%d", &emp[NumOfEmp].age);

				printf("Enter Employee Salary: "); // add data accordingly
				scanf("%lf", &emp[NumOfEmp].salary);

				printf("\n");
				NumOfEmp++;
			}
			else {
				printf("ERROR!!! Maximum Number of Employees Reached\n\n"); //print error message
				break;
		case 3:

			printf("\nUpdate Employee Salary\n");
			printf("===============\n");
			do {
				printf("Enter Employee ID: ");
				scanf("%d", &idToUpdate);

				//find userIDs index

				for (i = 0; i < SIZE; i++) {// for all spots in array
					if (idToUpdate == emp[i].num) {// if array contains entered number
						printf("The current salary is %.2lf", emp[i].salary);// print to screen
						printf("\nEnter Employee New Salary: ");// print to screen
						scanf("%lf", &emp[i].salary);
						printf("\n");//print to screen
						end++; // signal to end case
					}
				}
			} while (end == 0);

			break;

		case 4:

			printf("\nRemove Employee\n");
			printf("===============\n");
			do {
				printf("Enter Employee ID: ");
				scanf("%d", &idToUpdate);

				//find userIDs index

				for (i = 0; i < SIZE; i++) { // for all spots in array
					if (idToUpdate == emp[i].num) { // if array contains entered number
						printf("Employee %d will be removed\n", emp[i].num);// print to screen
						emp[i].num = 0; //reset to 0 num
						NumOfEmp--; //decrease number of employess so that another can be added
						end2++; // signal to end case
						printf("\n");// add line
					}
				}
			} while (end2 == 0);

			break;



		default:
			printf("ERROR: Incorrect Option: Try Again\n\n"); //print error message
			}

		}
	} while (option != 0);


	return 0;

}