there is a very frustrating problem with my queue linked list. the functions all work its just that after enqueue, dequeue or display the menu displays along with "Enter choice : Only one of the above can be your choice ". whats wrong?
#include <stdio.h>
#include <conio.h>
#include <ctype.h>
#include <stdlib.h>
#define TRUE 1
#define FALSE 0
void enqueue ();
void dequeue();
void list_node();
struct node
{
char item_name[30];
char item_code[30];
float item_price;
struct node *ptrnext;
};
struct node *front, *rear , *thisptr , *newptr;
void main ()
{
char ch;
front=NULL;
do
{
printf("\n\n [----------Queue Menu----------]");
printf("\nA - Enqueue queue");
printf("\nB - Dequeue queue");
printf("\nD - Display queue content");
printf("\nX - Exit \n");
printf("\nEnter Choice : ");
scanf("%c",&ch);
ch=toupper(ch);
switch(ch)
{
case 'A' : enqueue(); break;
case 'B' : dequeue();break;
case 'D' : list_node();break;
case 'X' : printf("Exit system");break;
default : printf("\nOnly one of the above can be your choice");
}
}while(ch != 'X');
}
void enqueue()
{
newptr=(struct node *)malloc(sizeof (struct node));
fflush(stdin);
printf("\nEnter Item Name :");
scanf("%[^\n]s",&newptr->item_name);
fflush(stdin);
printf("\nEnter Item Code : ");
scanf("%[^\n]s",&newptr->item_code);
fflush(stdin);
printf("\nEnter Item Price : ");
scanf("%f",&newptr->item_price);
newptr->ptrnext=NULL;
if (front==NULL)
{
front=newptr;
rear=newptr;
}
else
{
rear->ptrnext=newptr;
rear=newptr;
}
list_node();
}
void dequeue()
{
thisptr = front;
if (front==NULL)
{
printf("\nEmpty list\n\n");
return;
}
else
{
front=front->ptrnext;
free(thisptr);
}
}
void list_node()
{
if (front==NULL)
{
printf("\nEmpty list\n\n");
return;
}
thisptr=front;
do
{
printf("\n\nItem Name : %s",thisptr->item_name);
printf("\n\nItem Code : %s",thisptr->item_code);
printf("\n\nPrice of Item : %.2f",thisptr->item_price);
printf("\n");
thisptr=thisptr->ptrnext;
}while(thisptr != NULL);
}
