how do i want to plus total integer in liked list databse

[konata_89]

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

#define TRUE 1
#define FALSE 0


void new_item();
void list_item();
void search_item();
void buy_item();
void list_buy_item();
struct item
{
	float price;
	char item_name[20];
	int n_item;
	struct item *ptrnext;
};

struct item*headptr, *newptr, *currentptr,*previousptr,*headptr2, *newptr2, *currentptr2,*previousptr2;

void main()
{
	char ch;
	int choice=TRUE;

	headptr=(struct student*)NULL;
	while(choice==TRUE)

	{
		printf("\n\n1 - Enter new item");
		printf("\n2 - List all item");
		printf("\n3 - Search item");
		printf("\n4 - buy_item");
		printf("\n5 - Calculation");
		printf("\n6 - Exit\n");
		printf("\nEnter choice: ");
		scanf(" %c",&ch);
		switch(ch)
		{
		case '1':new_item();break;
		case '2':list_item();break;
		case '3':search_item();break;
		case '4':buy_item();break;
		case '5':list_buy_item();break;
		case '6': choice=FALSE; break;

		default: printf("\nEnter only one from the above");
		}
	}
}

void new_item()
{
  newptr=(struct item *)malloc(sizeof (struct item));

	printf("\nEnter new Item: ");
	scanf("%s",&newptr->item_name);

	printf("\nEnter item price : ");
	scanf("%f",&newptr->price);

	if (headptr==(struct item *)NULL)
		{headptr=newptr;
		 newptr->ptrnext=(struct item *)NULL;
		}

	else
	{
		currentptr=headptr;

		while(currentptr->ptrnext !=(struct item *)NULL)
		{
				currentptr=currentptr->ptrnext;
		}

				currentptr->ptrnext=newptr;
				newptr->ptrnext= NULL;
	}


}

void list_item()
{  printf("\nItem \tprice");
	if (headptr==(struct item*)NULL)
	{
		printf("\nEmpty list");
		return;
	}

	currentptr=headptr;
	do
	{
		printf("\n%s \t%.2f",currentptr->item_name,currentptr->price);
		currentptr=currentptr->ptrnext;
	}while(currentptr !=(struct item *)NULL);
}

void search_item()
{
item *temp;
char n[10];
int same;
printf("\n Enter the item:");
scanf("%s",&n);
temp=headptr;

if(headptr==NULL)
{
printf("\n Empty List");
return;
}
else
{
while (temp != NULL)
{
same=strcmpi(n,temp->item_name);
if(same==0)
{
printf("\n item price is = %.2f",temp->price);
break;
}
temp=temp->ptrnext;
}
if (temp == NULL)
{
printf("\n item &s not in the list",n);
}
}
}//end search


void buy_item()
{
item *temp;
char n[10];
int same;
printf("\n Item name:");
scanf("%s",&n);

temp=headptr;
if(headptr==NULL)
{
printf("\n no such item in the List");
return;
}
else
{
while (temp != NULL)
{
same=strcmpi(n,temp->item_name);
if(same==0)
{
newptr2=(struct item *)malloc(sizeof (struct item));
	printf("\nEnter item price : ");
	scanf("%f",&newptr2->price);
	printf("\nEnter item quantity : ");
	scanf("%d",&newptr2->n_item);

	if (headptr2==(struct item *)NULL)
		{
		 headptr2=newptr2;
		 newptr2->ptrnext=(struct item *)NULL;
		}

	else
	{
		currentptr2=headptr2;

		while(currentptr2->ptrnext !=(struct item *)NULL)
		{
				currentptr2=currentptr2->ptrnext;
		}

				currentptr2->ptrnext=newptr2;
				newptr2->ptrnext= NULL;
	}

break;
}
temp=temp->ptrnext;
}
if (temp == NULL)
{
printf("\n item %s not in database",n);
}
}
}

void list_buy_item()
{  float total,a,chance;
	printf("\nItem ");

	if (headptr2==(struct item*)NULL)
	{
		printf("\nEmpty list");
		return;
	}

	currentptr2=headptr2;
	if(currentptr2 !=(struct item *)NULL){

		total = (currentptr2->price*currentptr2->n_item);//<-----here what should i do so it can take the value from newptr2(node) and plust all the value from newptr2(node)
		total = total + (currentptr2->price);
		currentptr2=currentptr2->ptrnext;
		printf("\ntotal price%.2f",total);
		printf("\nenter customer money :");
		scanf("%f",&a);
		chance = a - total;
		if( chance< 0)
		{
		 printf("\nnot enough money");

		}else if( chance == 0 )
		{
			printf("no chance");
		}else
		{
			printf("\nthe chance is %f",chance);
		}

} }

[konata_89]

i need help for line 206-209

[Luckychap]

check your code for list_item() function where you are looping through all items in newptr. apply same logic to loop in newptr2 and add items.

[konata_89]

check your code for list_item() function where you are looping through all items in newptr. apply same logic to loop in newptr2 and add items.

that what im try but don't know la

[Luckychap]

that what im try but don't know la

No you are not. I haven't seen any loop in function list_buy_item().

Can you put your effort right here.