Inventory Management System In C Language

Here's a simple C Program to develop an Inventory Management System to display the inventory of items in a store. The inventory maintains details such as name, price, quantity & cost. And displays the values in a structured way.

// Inventory Management System.
// V 1.0
// MCA Ist Sem, 2015, University of Kashmir.
#include<stdio.h>
#include<conio.h>
struct item
{
     int itemno;
     char name[30];
     int quantity;
     int price;
     int tcost; //Total Cost
};
void add();
void update();
void sell();
void display();
void main()
{
int num;
while (1)
{
	clrscr();
	printf("\t\t\t*************************************\n");
    printf(" \t\t\t|    Inventory Management System    |\n");
    printf(" \t\t\t|              V 1.0                |\n");
    printf(" \t\t\t|    PGDCA, University of Kashmir   |\n");
    printf("\t\t\t*************************************\n");
	printf("\t\t\t\t1 : Add New Item\n");
	printf("\t\t\t\t2 : Sell An Item \n");
	printf("\t\t\t\t3 : Update Existing Item \n");
	printf("\t\t\t\t4 : Show Inventory \n");
	printf("\t\t\t\t5 : Exit \n");
	printf("\t\t\t\t  Enter your choice");
	printf("\n\t\t\t*************************************\n");
	scanf("%d",&num);
	switch (num)
	{
	case 1:
	add();
	break;
	case 2:
	sell();
	break;
	case 3:
	update();
	break;
	case 4:
	display();
	break;
	case 5:
	printf("Closing.....\n");
	exit(1);
	break;
	default:
	printf("Wrong Choice Entered, Press A Key To Continue... \n");
	getch();
	main();
	}
}
}
void add()
{
      struct item it;
      FILE *ptr;
      ptr=fopen("inventory.docx","a");
	  flushall();
      printf("Enter Item Name\n");
      scanf("%s",it.name);
      printf("Enter Item Code\n");
      scanf("%d",&it.itemno);
      printf("Enter Quantity\n");
      scanf("%d",&it.quantity);
      printf("Enter Price\n");
      scanf("%d",&it.price);
      it.tcost=it.quantity*it.price; // Calculating Total Cost
      fprintf(ptr,"\n%s\t%d\t%d\t%d\t%d",it.name,it.itemno,it.quantity,it.price,it.tcost); // Adding/Appending new record to the file.
      fclose(ptr);
      printf("ITEM ADDED SUCESSFULLY\n");
      getch();
}
void display()
{
	struct item it;
	FILE * ptr;
	ptr=fopen("inventory.docx","r");
	if (ptr==NULL)
	{
	printf("Nothing to show, Inventory is empty!\n");
	}
	else
	{
	clrscr();
	printf("             *****  INVENTORY *****\n");
	printf("---------------------------------------------------------\n");
	printf("|CODE|     NAME           | QUANTITY |   PRICE |  COST |\n");
	printf("---------------------------------------------------------\n");
	while(!feof(ptr))
	      {
			fscanf(ptr,"%s%d%d%d%d",&it.name,&it.itemno,&it.quantity,&it.price,&it.tcost); //Reading the records in the file.
			printf(" %-5d     %-13s       %-6d      %-5d   %d\n",it.itemno,it.name,it.quantity,it.price,it.tcost); //Printing the records
			printf("---------------------------------------------------------\n");
	      }
	fclose(ptr);
	}
	getch();

}
void sell()
{
	struct item it[30];
	FILE * ptr;
	int i=0,j,k,qty,itno,flag=0;
	ptr=fopen("inventory.docx","r");
	if (ptr==NULL)
	printf("No Items Available to sell, Inventory is empty!\n");
	else
	{
	printf("Enter Item Code\n");
	scanf("%d",&itno);
	 while(!feof(ptr))
	   {
	      fscanf(ptr,"%s%d%d%d%d",it[i].name,&it[i].itemno,&it[i].quantity,&it[i].price,&it[i].tcost);
	      i++;
	    }
    j=i;
    fclose(ptr);
    ptr=fopen("inventory.docx","w");
    for(k=0;k<j;k++)
       {
	       if(itno==it[k].itemno)
	       {
		     printf("Enter Quantity\n");
		     scanf("%d",&qty);
		     if (qty>it[k].quantity)
		     printf("Insufficient Quantity\n");
		     else
		     { it[k].quantity=it[k].quantity-qty; // Updating the quantity
		       it[k].tcost=it[k].quantity*it[k].price;
		       flag=1;
		      }
	       }
	      fprintf(ptr,"\n%s\t%d\t%d\t%d\t%d",it[k].name,it[k].itemno,it[k].quantity,it[k].price,it[k].tcost);
       }
       fclose(ptr);
    if(flag!=1)
       {
			printf("ITEM IS NOT PRESENT\n");
		}
	else
		{
			printf("ITEMS SOLD\n");
		}
	}
    getch();
}
void update()
{
	struct item it[30];
	FILE * ptr;
	int i=0,j,k,qty,itno,prc,flag=0;
	ptr=fopen("inventory.docx","r");
	if (ptr==NULL)
		printf("No Items Available to sell, Inventory is empty!\n");
	else
		{
		printf("Enter Item Code\n");
		scanf("%d",&itno);
		while(!feof(ptr))
			{
			fscanf(ptr,"%s%d%d%d%d",&it[i].name,&it[i].itemno,&it[i].quantity,&it[i].price,&it[i].tcost);
			i++;
			}
       j=i;
       fclose(ptr);
       ptr=fopen("inventory.docx","w");
       for(k=0;k<j;k++)
       {
	       if(itno==it[k].itemno)
	       {
		     printf("Enter New Quantity For %s\n", it[k].name);
		     scanf("%d",&qty);
		     printf("Enter New Price\n");
		     scanf("%d",&prc);
		     it[k].quantity=it[k].quantity+qty;
		     it[k].price=prc;
		     it[k].tcost=it[k].quantity*it[k].price;
		     flag=1;
			}
	    fprintf(ptr,"\n%s\t%d\t%d\t%d\t%d",it[k].name,it[k].itemno,it[k].quantity,it[k].price,it[k].tcost);
       }
    fclose(ptr);
    if(flag!=1)
       {
			printf("ITEM IS NOT PRESENT\n");
		}
	else
		{
			printf("DETAILS UPDATED\n");
		}
	}
    getch();
}