Cant figure out the error. Error is "expected unqualified id before 'delete'. This error is at line 206

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  1  /*
  2  This code is written by:
  3  
  4  rana muneeb
  5  
  6  */
  7  
  8  #include<stdio.h>
  9  #include<stdlib.h>
 10  #include<string.h>
 11  
 12  struct node
 13  {
 14      char foodname[50];
 15      int quantity;
 16      float price;
 17      int data;
 18      struct node *prev;
 19      struct node *next;
 20  };
 21  
 22  struct node *headc = NULL,*newnode,*tailc = NULL;
 23  struct node *heada = NULL, *taila = NULL;
 24  struct node *head_s;
 25  
 26  void adminmenu()
 27  {
 28      printf("\n\t\t\t\t\t\t\t1. View total sales\n");
 29      printf("\t\t\t\t\t\t\t2. Add new items in the order menu\n");
 30      printf("\t\t\t\t\t\t\t3. Delete items from the order menu\n");
 31      printf("\t\t\t\t\t\t\t4. Display order menu\n");
 32      printf("\t\t\t\t\t\t\t5. Back To Main Menu \n\n");
 33      printf("\t\t\t\t\t\t\t   Enter Your Choice --->");
 34  }
 35  
 36  void customermenu()
 37  {
 38      printf("\n\t\t\t\t\t\t\t1. Place your order\n");
 39      printf("\t\t\t\t\t\t\t2. View your ordered items\n");
 40      printf("\t\t\t\t\t\t\t3. Delete an item from order\n");
 41      printf("\t\t\t\t\t\t\t4. Display final bill\n");
 42      printf("\t\t\t\t\t\t\t5. Back To Main Menu \n\n");
 43      printf("\t\t\t\t\t\t\t   Enter Your Choice --->");
 44  }
 45  
 46  struct node* createadmin(struct node *head,int data, char foodname[25], float price)
 47  {
 48      newnode = (struct node*)malloc(sizeof(struct node));
 49  
 50      newnode->data = data;
 51      newnode->price = price;
 52      newnode-> quantity = 0;
 53      strcpy(newnode->foodname,foodname);
 54      newnode->next = NULL;
 55      newnode->prev = NULL;
 56  
 57      struct node *temp = head;
 58  
 59      if(temp==NULL)
 60          heada = taila = newnode;
 61      else
 62      {
 63          while(temp->next!=NULL)
 64              temp=temp->next;
 65  
 66          temp->next=newnode;
 67          newnode->prev = taila;
 68          taila = newnode;
 69      }
 70  
 71      return heada;
 72  }
 73  
 74  struct node* createcustomer(struct node *head,int data,int quantity)
 75  {
 76      newnode = (struct node*)malloc(sizeof(struct node));
 77  
 78      struct node *temp1 = heada;
 79      int flag = 0;
 80      while(temp1!=NULL)
 81      {
 82          if(temp1->data==data)
 83          {
 84              flag = 1;
 85              break;
 86          }
 87          temp1 = temp1->next;
 88      }
 89  
 90      if(flag==1)
 91      {
 92          newnode->data = data;
 93          newnode->price = quantity*(temp1->price);
 94          newnode-> quantity = quantity;
 95          strcpy(newnode->foodname,temp1->foodname);
 96          newnode->next = NULL;
 97          newnode->prev = NULL;
 98  
 99          struct node *temp = head;
100  
101          if(temp==NULL)
102              headc = tailc = newnode;
103          else
104          {
105              while(temp->next!=NULL)
106                  temp=temp->next;
107  
108              temp->next=newnode;
109              newnode->prev = tailc;
110              tailc = newnode;
111          }
112  
113  
114      }
115      else
116      {
117          printf("\n\t\t\t\t\t\t\tThis item is not present in the menu!\n");
118      }
119      return headc;
120  }
121  
122  void displayList(struct node *head)
123  {
124      struct node *temp1 = head;
125      if(temp1==NULL)
126      {
127          printf("\n\t\t\t\t\t\t\t\tList is empty!!\n\n");
128      }
129      else
130      {
131          printf("\n");
132          while(temp1!=NULL)
133          {
134              if(temp1->quantity==0)
135                  printf("\t\t\t\t\t\t\t%d\t%s\t%0.2f\n",temp1->data,temp1->foodname,temp1->price);
136              else
137              {
138                  printf("\t\t\t\t\t\t\t%d\t%s\t%d\t%0.2f\n",temp1->data,temp1->foodname,temp1->quantity,temp1->price);
139              }
140  
141              temp1 = temp1->next;
142          }
143          printf("\n");
144      }
145  
146  }
147  
148  struct node* totalsales(int data,int quantity)
149  {
150      newnode = (struct node*)malloc(sizeof(struct node));
151      int flag = 0;
152  
153      struct node *temp1 = heada;
154      while(temp1->data!=data)
155      {
156          temp1 = temp1->next;
157      }
158  
159      newnode->data = data;
160      newnode->price = quantity*(temp1->price);
161      newnode-> quantity = quantity;
162      strcpy(newnode->foodname,temp1->foodname);
163      newnode->next = NULL;
164      newnode->prev = NULL;
165  
166      struct node *temp = head_s;
167  
168      if(temp==NULL)
169          head_s = newnode;
170      else
171      {
172          while(temp->next!=NULL)
173          {
174              if(temp->data==data)
175              {
176                  flag = 1;
177                  break;
178              }
179              temp=temp->next;
180          }
181  
182          if(flag==1)
183          {
184              temp->quantity += newnode-> quantity;
185              temp->price += newnode->price;
186          }
187          else
188          {
189              temp->next=newnode;
190          }
191      }
192  
193      return head_s;
194  }
195  
196  void calculatetotsales()
197  {
198      struct node *temp = headc;
199      while(temp!=NULL)
200      {
201          head_s = totalsales(temp->data, temp->quantity);
202          temp=temp->next;
203      }
204  }
205  
206  struct node* delete(int data,struct node *head, struct node* tail)
207  {
208      if(head==NULL)
209      {
210          printf("\n\t\t\t\t\t\t\tList is empty\n");
211      }
212      else
213      {
214          struct node* temp;
215          if(data==head->data)
216          {
217              temp = head;
218              head = head->next;
219              if (head != NULL)
220                  head->prev = NULL;
221              free(temp);
222          }
223          else if(data==tail->data)
224          {
225              temp = tail;
226              tail = tail->prev;
227              tail->next = NULL;
228              free(temp);
229          }
230          else
231          {
232              temp = head;
233              while(data!=temp->data)
234              {
235                  temp = temp->next;
236              }
237              (temp->prev)->next = temp->next;
238              (temp->next)->prev = temp->prev;
239              free(temp);
240          }
241      }
242      return head;
243  }
244  
245  int deleteadmin()
246  {
247      printf("\n\t\t\t\t\tEnter serial no. of the food item which is to be deleted: ");
248      int num;
249      scanf("%d",&num);
250  
251      struct node* temp=heada;
252      while(temp!=NULL)
253      {
254          if (temp->data == num)
255          {
256              heada = delete(num, heada, taila);
257              return 1;
258          }
259          temp=temp->next;
260      }
261  
262      return 0;
263  }
264  
265  int deletecustomer()
266  {
267      printf("\n\t\t\t\t\tEnter serial no. of the food item which is to be deleted: ");
268      int num;
269      scanf("%d",&num);
270  
271      struct node* temp=headc;
272      while(temp!=NULL)
273      {
274          if (temp->data == num)
275          {
276              headc = delete(num, headc, tailc);
277              return 1;
278          }
279          temp=temp->next;
280      }
281  
282      return 0;
283  }
284  
285  void displaybill()
286  {
287      displayList(headc);
288      struct node *temp = headc;
289      float total_price = 0;
290      while (temp!=NULL)
291      {
292          total_price +=temp->price;
293          temp = temp->next;
294      }
295  
296      printf("\t\t\t\t\t\t\tTotal price: %0.02f\n",total_price);
297  
298  }
299  
300  struct node* deleteList(struct node* head)
301  {
302      if(head==NULL)
303      {
304          return NULL;
305      }
306      else
307      {
308          struct node* temp = head;
309          while(temp->next!=0)
310          {
311              temp = temp->next;
312              free(temp->prev);
313          }
314          free(temp);
315          head = NULL;
316      }
317  
318      return head;
319  }
320  
321  void admin()
322  {
323      printf("\n\t\t\t\t\t   ----------------------------------------------\n");
324      printf("\t\t\t\t\t\t\t    ADMIN SECTION\n");
325      printf("\t\t\t\t\t   ----------------------------------------------\n");
326      while(1)
327      {
328          adminmenu();
329  
330          int opt;
331          scanf("%d",&opt);
332  
333          if(opt==5)
334              break;
335  
336          switch (opt)
337          {
338              case 1:
339                  displayList(head_s);
340                  break;
341              case 2:
342  
343                  printf("\n\t\t\t\t\t\t\tEnter serial no. of the food item: ");
344                  int num,flag = 0;
345                  char name[50];
346                  float price;
347                  scanf("%d",&num);
348  
349                  struct node *temp = heada;
350  
351                  while(temp!=NULL)
352                  {
353                      if(temp->data==num)
354                      {
355                          printf("\n\t\t\t\t\t\tFood item with given serial number already exists!!\n\n");
356                          flag = 1;
357                          break;
358                      }
359                      temp = temp->next;
360                  }
361  
362                  if(flag==1)
363                      break;
364  
365                  printf("\t\t\t\t\t\t\tEnter food item name: ");
366                  scanf("%s",name);
367                  printf("\t\t\t\t\t\t\tEnter price: ");
368                  scanf("%f",&price);
369                  heada = createadmin(heada, num, name, price);
370                  printf("\n\t\t\t\t\t\t\tNew food item added to the list!!\n\n");
371                  break;
372              case 3:
373                  if(deleteadmin())
374                  {
375                      printf("\n\t\t\t\t\t\t### Updated list of food items menu ###\n");
376                      displayList(heada);
377                  }
378                  else
379                      printf("\n\t\t\t\t\t\tFood item with given serial number doesn't exist!\n\n");
380  
381                  break;
382              case 4:
383                  printf("\n\t\t\t\t\t\t\t   ### Order menu ###\n");
384                  displayList(heada);
385                  break;
386  
387              default:
388                  printf("\n\t\t\t\t\t\tWrong Input !! PLease choose valid option\n");
389                  break;
390          }
391      }
392  }
393  
394  void customer()
395  {
396      int flag=0,j=1;
397      char ch;
398      printf("\n\t\t\t\t\t   ----------------------------------------------\n");
399      printf("\t\t\t\t\t\t\t    CUSTOMER SECTION\n");
400      printf("\t\t\t\t\t   ----------------------------------------------\n");
401      while(1)
402      {
403          customermenu();
404  
405          int opt;
406          scanf("%d",&opt);
407  
408          if(opt==5)
409              break;
410  
411          switch (opt)
412          {
413              case 1:
414                  displayList(heada);
415                  printf("\n\t\t\t\t\t\tEnter number corresponding to the item you want to order: ");
416                  int n;
417                  scanf("%d",&n);
418                  printf("\t\t\t\t\t\tEnter quantity: ");
419                  int quantity;
420                  scanf("%d",&quantity);
421                  headc = createcustomer(headc, n, quantity);
422                  break;
423              case 2:
424                  printf("\n\t\t\t\t\t\t\t  ### List of ordered items ###\n");
425                  displayList(headc);
426                  break;
427              case 3:
428                  if(deletecustomer())
429                  {
430                      printf("\n\t\t\t\t\t\t### Updated list of your ordered food items ###\n");
431                      displayList(headc);
432                  }
433                  else
434                      printf("\n\t\t\t\t\t\tFood item with given serial number doesn't exist!!\n");
435                  break;
436              case 4:
437                  calculatetotsales();
438                  printf("\n\t\t\t\t\t\t\t  ### Final Bill ###\n");
439                  displaybill();
440                  headc = deleteList(headc);
441                  printf("\n\t\t\t\t\t\tPress any key to return to main menu:\n\t\t\t\t\t\t");
442                  fflush(stdin);
443                  ch=fgetc(stdin);
444                  flag=1;
445                  break;
446  
447              default:
448                  printf("\n\t\t\t\t\t\tWrong Input !! PLease choose valid option\n");
449                  break;
450          }
451          if(flag==1)
452              break;
453      }
454  }
455  
456  void mainnenu()
457  {
458      printf("\n                                 **************************************************************************\n");
459      printf("                                                     WELCOME TO RESTAURANT MANAGEMENT SYSTEM\n");
460      printf("                                 **************************************************************************\n\n\n");
461      printf("\t\t\t\t\t\t\t1. ADMIN SECTION--> \n");
462      printf("\t\t\t\t\t\t\t2. CUSTOMER SECTION--> \n");
463      printf("\t\t\t\t\t\t\t3. Exit--> \n\n");
464      printf("\t\t\t\t\t\t\tEnter Your Choice --->");
465  }
466  
467  int main()
468  {
469      heada = createadmin(heada,1,"Hot and Sour Soup",100);
470      heada = createadmin(heada,2,"Manchow Soup",200);
471      heada = createadmin(heada,3,"Manchurian Noodles",150);
472      heada = createadmin(heada,4,"Fried Rice",180);
473      heada = createadmin(heada,5,"Hakka Noodles",80);
474  
475      while(1)
476      {
477          mainnenu();
478          int choice;
479          scanf("%d",&choice);
480  
481          if(choice==3)
482          {
483              printf("\n\n\t\t\t\t\t\t\t**********Thank you!!**********\n");
484              break;
485          }
486  
487          switch (choice)
488          {
489              case 1:
490                  admin();
491                  break;
492              case 2:
493                  customer();
494                  break;
495              case 3:
496                  break;
497  
498              default:
499                  printf("\n\t\t\t\t\t\tWrong Input !! PLease choose valid option\n");
500                  break;
501          }
502      }
503  }

What I have tried:

struct node* delete(int data,struct node *head, struct node* tail)
{

line :206
not able to figure out the error. can anyone help me out

Posted 19-Jun-22 2:39am

zig xcalaber

Updated 19-Jun-22 3:23am

0x01AA

v2

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Comments

0x01AA 19-Jun-22 8:47am

delete is a reserved word in c++. Rename it to e.g. MyDelete (of course try to find a better name) and you should be out of problems.

1 solution

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k5054 · Answer 1 · 2022-06-19T03:23:00

Solution 1

As 0x01AA points out delete is a reserved word in C++. However, it looks like you're writing C, not C++, and delete is not reserved in C. Compiling with C rather than C++ produces no errors. Whether the program does what you want it to or not, is another question. I have not tried to run it.

Posted 19-Jun-22 3:23am

k5054

Comments

0x01AA 19-Jun-22 9:26am

Cool one this 'c vs. c++' explanation. 5

CPallini 20-Jun-22 2:07am

5.