#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<windows.h>
#define MAX 100


struct shop
{

	char name [30];
	int price;
	int count;

} shop_list[MAX];

void init_list(void);
void enter(void);
int delet(void);
void list(void);
int menu_select(void);
int find_free(void);

int main(void)


{


	char choice;
	init_list();
	for(;;)
	{
		system("cls");
		choice = menu_select();
		switch(choice)
		{
			case 1: enter();
			system("pause>0");
			break;
			case 2: delet();
			system("pause>0");
			break;
			case 3: list();
			system("pause>0");
			break;
			case 4: exit(0);
		}

	}
	return 0;
}
void init_list(void)
{
	register int t;
	for (t=0; t<MAX; ++t) shop_list[t].name[0] = '\0';
}



int menu_select(void)
{
		char s[80];
		int c;

		printf("1. Enter name\n");
		printf("2. Delete name\n");
		printf("3. Display the list\n");
		printf("4. Exit\n");

		do
		{
			printf("\nEnter the number of the desired item: ");
			gets(s);
			c = atoi(s);
		} while ((c<0 || c>4));
		return c;

}

void enter (void)
{
	char name[80];
	int price;
	int count;

	printf("Enter name:");
	gets(name);

	for(int i=0;shop_list[i].name[0] && i < MAX;i++)
	{
		if(strcmp(shop_list[i].name,name) == 0)
		{
			printf("Product exists\n");
			printf("Enter just count:");
			scanf("%i",&count);
			shop_list[i].count = shop_list[i].count + count;
			return;
		}
	}


	printf("Enter price:");
	scanf("%i",&price);
	printf("Enter count:");
	scanf("%i",&count);

	register int i = 0;





	int slot;
	slot = find_free();
	if(slot==-1)
	{
		printf("\nList is full ");
		return;

	}
	else
	{
		strcpy(shop_list[slot].name,name);
		shop_list[slot].price = price;
		shop_list[slot].count = count;

	}
}


int find_free(void)
{
	register int t;
	for (t=0; shop_list[t].name[0] !='\0' && t<MAX; ++t);
	if (t==MAX) return -1;
	return t;
}
int delet(void)
{
	char s[80];
	printf("Enter name of product for del:");
	gets(s);
	register int i = 0;
	int flag = -1;
	for(i=0;shop_list[i].name[0] && i < MAX;i++)
	{
		if(strcmp(shop_list[i].name,s) == 0)
		{
			flag = 0;
			shop_list[i].name[0] = '\0';
		}
	}
	return flag;

}
void list(void)
{
	register int t;
	for(t=0; t<MAX; ++t)


	{
		if(shop_list[t].name[0])
		{



			printf("%s ", shop_list[t].name);
			printf("%i ", shop_list[t].price);
			printf("%i\n", shop_list[t].count);

		}


	}
	printf("\n\n");
}