/* The program gets details about payment and manage them */

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <alloc.h>
typedef struct
{
	char name;
	int pay;
} details;

/*  Reading details */
details ReadPay()
{
	details st;
	printf("\nReading pay:\n\n");
	printf("Name: ");
	flushall();
	gets(st.name);
	printf("Pay: ");
	scanf("%d", &st.pay);
	return st;
}

/* Print all details about paying */
void PrintDetails(details s)
{
	printf("name: %s", s.name);
	printf("pay: %d", s.pay);
}

/* Add details of one pay */
 
details *AddPay(details *arr, int *cptr)
{
	(*cptr)++;
	arr = (details*)realloc(arr, sizeof(details)*(*cptr));
	if (arr=NULL)
	{
		printf("Failed to allocate memory...\n");
		exit(1);
	}
	arr = ReadPay();
	return arr;
}

/* Delete details of one pay */
void DelPay(details *arr, int *cptr)
{
	int num;
	(*cptr)--;
	if (*cptr<0)
	{
		printf("\nNo details to delete...");
		getch();
		return;
	}
	printf("\nEnter Pay number to delete(0-%d):", *cptr);
	scanf("%d", &num);
	if (num<0 || num>=*cptr)
	{
		printf("Wrong value...\n");
		return;
	}
	arr = arr;
}

/* Printing the details of paying */
void ShowList(details *arr, int counter)
{
	int i;
	if (counter<=0)
		printf("\nNo details to show...");
	for (i=0 ; i<counter ; i++)
		PrintDetails(arr);
	getch();
}

/* Printing menu */
void PrintMenu()
{     
	clrscr();
	printf("The pay program menu: \n\n");
	printf("a. Add new payment\n");
	printf("d. Delete a payment\n");
	printf("s. Show all pay\n");
	printf("e. Exit\n");
}

void main()
{
	details *var = NULL;
	int counter=0;
	char option;
	do
	{
		PrintMenu();
		option = getch();
		switch (option)
		{
		case 'a': var = AddPay(var, &counter);
			break;
		case 'd': DelPay(var, &counter);
			break;
		case 's': ShowList(var, counter);
			break;
		case 'e': printf("GoodBye...\n");
			break;
		default : printf("Wrong Key...");
		}
	} while (option != 'e');
	if (var != NULL)
		free(var);
}