ANOTHER FUCKING STACK

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <malloc.h>
#include <string.h>

void clrscr() {
	system("@cls||clear");
}

struct node {
	struct node *next;
	char name[30];
	int qty;
	char type[5];
	int price;
};

struct node *start = NULL;
struct node *create_ll(struct node*);
struct node *display(struct node*);
struct node *insert_end(struct node*);
struct node *delete_beg(struct node*);

void menu() {
	printf("COOL COMPUTER ADMINSTRATOR\n");
	printf("++++++++++++++++++++++++++\n\n");
	printf("1. Item List\n");
	printf("2. Add <push> new item\n");
	printf("3. Delete <pop> recently added item\n");
	printf("4. Exit\n\n");
	printf("> Input your choice : ");
}

int main() {
	int choice;

	do {
		clrscr();
		menu();
		scanf("%d", &choice);
		switch(choice) {
			case 1: {
				clrscr();
				start = display(start);
				getch();
				break;
			}
			case 2: {
				clrscr();
				start = create_ll(start);
				printf("\n--- Item was sucessfully added! ---");
				getch();
				break;
			}
			case 3: {

				break;
			}
		}
	} while (choice != 4);
}

struct node *create_ll(struct node *start) {
	struct node *new_node, *ptr;
	char nname[20], ttype[20];
	int qqty, pprice;
	int tc = 0;

	do {
		printf("> Input name [3...20] :");
		fflush(stdin);
		scanf("%[^\n]", &nname);
	} while (strlen(nname) < 3 || strlen(nname) > 20);
	do {
		printf("\n> Input type [processor/graphic card/memory] : ");
		scanf("%s", &ttype);
		if (strcmp("processor", ttype) == 0) {
			tc = 1;
		} else if (strcmp("graphic card", ttype) == 0) {
			tc = 1;
		} else if (strcmp("memory", ttype) == 0) {
			tc = 1;
		} else {
			tc = 0;
		}
	} while (tc == 0);
	do {
		printf("\n> Input quantity [1...20] : ");
		scanf("%d", &qqty);
	} while (qqty < 4 || qqty > 20);
	do {
		printf("\n > Input price [$1...$1000]: ");
		scanf("%d", &pprice);
	} while (pprice < 1 || pprice > 1000);
	new_node = (struct node* ) malloc(sizeof(struct node));
	strcpy(new_node -> name, nname);
	new_node -> qty = qqty;
	strcpy(new_node -> type, ttype);
	new_node -> price = pprice;
	if (start == NULL) {
		new_node -> next = NULL;
		start = new_node;
	} else {
		ptr = start;
		while (ptr -> next != NULL) {
			ptr = ptr -> next;
		}
		ptr -> next = new_node;
		new_node -> next = NULL;
	}
	return start;
}

struct node * display(struct node *start) {
	int no=1;
	struct node *ptr;
	ptr = start;
	clrscr();
	printf("\t\t--- ITEM LIST ---\n\n");
	printf("------+-------------------+---------------+----------+-------+\n");
	printf("| No. | Name              | Type          | Quantity | Price |\n");
	printf("------+-------------------+---------------+----------+-------+\n");
	while (ptr != NULL) {
		printf("|");
		printf(" %-4d|", no);
		printf(" %-18s|", ptr -> name);
		printf(" %-18s|", ptr -> type);
		printf(" %-9d|", ptr -> qty);
		printf(" %-6d|\n", ptr -> price);
		ptr = ptr -> next;
		no++;
	}
	printf("------+-------------------+--------+----------+-------+\n");
	return start;
}