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Parse Error Before 'else'

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Parse Error Before 'else'

 
0
  #1
Oct 8th, 2008
FIXED - I'm getting a parse error somewhere in this section of code before the else and I can't see it. Please help someone.

NEED HELP HERE -
Okay, I'm apparently getting a parse error somewhere in this code. Any help?

All the errors are listed as "Parse error before '.'" and are happening in the main function at the very end of the code. The first is inside the while statement.

C++ Syntax (Toggle Plain Text) 
  1. // This is the implementation file for class List
  2.  
  3. #include <iostream>
  4. #include <fstream>
  5. #include <stddef.h>		// to access NULL
  6. #include "List.h"
  7. using namespace std;
  8.  
  9. typedef NodeType* NodePtr;
  10.  
  11. struct NodeType
  12. {
  13.     ItemType item;
  14.     NodePtr  next;
  15. };
  16.  
  17. List::List()
  18. // Post:  listPtr is set to NULL.
  19. {
  20.     listPtr = NULL;
  21. }
  22.  
  23. //***********************************************************
  24. List::List(const List&  otherList)
  25. // Copy-constructor for List.
  26. {
  27.     NodeType* ptr1;
  28. 	NodeType* ptr2;
  29.  
  30. 	if (otherList.listPtr == NULL)
  31. 		{ listPtr = NULL; }
  32. 	else
  33. 	{
  34. 		listPtr = new NodeType;
  35. 		listPtr->item = otherList.listPtr->item;
  36. 		ptr1 = otherList.listPtr->next;
  37. 		ptr2 = listPtr;
  38. 		while (ptr1 != NULL)
  39. 		{ ptr2->next = new NodeType;
  40. 		  ptr2 = ptr2->next;
  41. 		  ptr2->item = ptr1->item;
  42. 		  ptr1 = ptr1->next;
  43. 		}
  44. 	ptr2->next = NULL;
  45. 	}
  46. }
  47.  
  48. //***********************************************************
  49. bool  List::IsThere(ItemType  item) const
  50. // Post: If item is in the list IsThere is
  51. //       True; False, otherwise.
  52. {
  53. 	NodeType* location = listPtr;
  54.  
  55.     while (location != NULL)
  56.           { if (item == listPtr->item )
  57.                { return true; } }
  58. 	return false;
  59. }
  60.  
  61. //***********************************************************
  62. void  List::Insert(ItemType  item)
  63. // Pre:  item is not already in the list.
  64. // Post: item is the first item in the list.
  65. {
  66. 	NodeType* location;
  67.  
  68. 	if (IsThere(item) == false)
  69. 	{ location = new NodeType;
  70. 	  location->item = item;
  71. 	  location->next = listPtr;
  72. 	  listPtr = location;
  73. 	}
  74. }
  75.  
  76. //***********************************************************
  77. void  List::Delete(ItemType  item)
  78. // Pre:  item is in the list.
  79. // Post: item is no longer in the list.
  80. {
  81. 	NodeType* location = listPtr;
  82. 	NodeType* tempLocation;
  83.  
  84. 	if (IsThere(item) == true)
  85. 		{ tempLocation = location->next;
  86. 		  listPtr = listPtr->next;
  87. 		}
  88. 	else
  89. 	    {
  90. 		  while (IsThere(item) == true)
  91. 			     { location = location->next; }
  92.  
  93. 		  tempLocation = location->next;
  94. 		  location->next = (location->next)->next;
  95. 	    }
  96. 	delete tempLocation;
  97. }
  98.  
  99. //***********************************************************
  100. void  List::Print() const
  101. // Post: Items on the list are printed on the screen.
  102. {
  103. 	NodeType* location = listPtr;
  104.  
  105. 	while (location != NULL)
  106. 		  { cout << location->item << endl;
  107. 	        location = location->next; }
  108. }
  109.  
  110. //***********************************************************
  111. int  List::Length() const
  112. // Post: Number of items have been counted; result returned.
  113. {
  114.     NodeType* location = listPtr;
  115. 	int length = 0;
  116.  
  117. 	while (location != NULL)
  118. 		  { location = location->next;
  119. 			length++; }
  120. 	return length;
  121. }
  122.  
  123. //***********************************************************
  124. List::~List()
  125. // Post: All the components are deleted.
  126. {
  127.     NodeType* tempPtr;
  128.  
  129. 	while (listPtr != NULL)
  130. 	{
  131. 		tempPtr = listPtr;
  132. 		listPtr = listPtr->next;
  133. 		delete tempPtr;
  134. 	}
  135. }
  136.  
  137.  
  138.  
  139. int main ()
  140. {
  141. 	ifstream InData;
  142. 	InData.open ("int.dat");
  143. 	while (InData)
  144. 	{ List.Insert(InData); }
  145.     int length = List.Length();
  146. 	cout << "There are " << length << " many items in this list." << endl;
  147. 	List.Print();
  148.  
  149. 	system ("pause");
  150. 	return 0;
  151. }
Last edited by DemonGal711; Oct 8th, 2008 at 1:51 pm.
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Re: Parse Error Before 'else'

 
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  #2
Oct 8th, 2008
Your else is outside your while loop .. it might help to format your code more cleanly

C++ Syntax (Toggle Plain Text) 
  1. while (location != NULL){ 
  2.   if (item == listPtr->item ){ 
  3.     return true; 
  4.   } 
  5. } // while ends 
  6. // now we have an else without an if 
  7. // statement 
  8. else{ 
  9.   return false; 
  10. }
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Re: Parse Error Before 'else'

 
0
  #3
Oct 8th, 2008
Yeah, I realized that. Now I have another issue of more parse errors later in my program. I thought that was causing the rest, like a missing semi-colon or something. But apparently not.

All the errors are happening in the main function at the very end. The first is inside the while statement.

C++ Syntax (Toggle Plain Text) 
  1. // This is the implementation file for class List
  2.  
  3. #include <iostream>
  4. #include <fstream>
  5. #include <stddef.h>		// to access NULL
  6. #include "List.h"
  7. using namespace std;
  8.  
  9. typedef NodeType* NodePtr;
  10.  
  11. struct NodeType
  12. {
  13.     ItemType item;
  14.     NodePtr  next;
  15. };
  16.  
  17. List::List()
  18. // Post:  listPtr is set to NULL.
  19. {
  20.     listPtr = NULL;
  21. }
  22.  
  23. //***********************************************************
  24. List::List(const List&  otherList)
  25. // Copy-constructor for List.
  26. {
  27.     NodeType* ptr1;
  28. 	NodeType* ptr2;
  29.  
  30. 	if (otherList.listPtr == NULL)
  31. 		{ listPtr = NULL; }
  32. 	else
  33. 	{
  34. 		listPtr = new NodeType;
  35. 		listPtr->item = otherList.listPtr->item;
  36. 		ptr1 = otherList.listPtr->next;
  37. 		ptr2 = listPtr;
  38. 		while (ptr1 != NULL)
  39. 		{ ptr2->next = new NodeType;
  40. 		  ptr2 = ptr2->next;
  41. 		  ptr2->item = ptr1->item;
  42. 		  ptr1 = ptr1->next;
  43. 		}
  44. 	ptr2->next = NULL;
  45. 	}
  46. }
  47.  
  48. //***********************************************************
  49. bool  List::IsThere(ItemType  item) const
  50. // Post: If item is in the list IsThere is
  51. //       True; False, otherwise.
  52. {
  53. 	NodeType* location = listPtr;
  54.  
  55.     while (location != NULL)
  56.           { if (item == listPtr->item )
  57.                { return true; } }
  58. 	return false;
  59. }
  60.  
  61. //***********************************************************
  62. void  List::Insert(ItemType  item)
  63. // Pre:  item is not already in the list.
  64. // Post: item is the first item in the list.
  65. {
  66. 	NodeType* location;
  67.  
  68. 	if (IsThere(item) == false)
  69. 	{ location = new NodeType;
  70. 	  location->item = item;
  71. 	  location->next = listPtr;
  72. 	  listPtr = location;
  73. 	}
  74. }
  75.  
  76. //***********************************************************
  77. void  List::Delete(ItemType  item)
  78. // Pre:  item is in the list.
  79. // Post: item is no longer in the list.
  80. {
  81. 	NodeType* location = listPtr;
  82. 	NodeType* tempLocation;
  83.  
  84. 	if (IsThere(item) == true)
  85. 		{ tempLocation = location->next;
  86. 		  listPtr = listPtr->next;
  87. 		}
  88. 	else
  89. 	    {
  90. 		  while (IsThere(item) == true)
  91. 			     { location = location->next; }
  92.  
  93. 		  tempLocation = location->next;
  94. 		  location->next = (location->next)->next;
  95. 	    }
  96. 	delete tempLocation;
  97. }
  98.  
  99. //***********************************************************
  100. void  List::Print() const
  101. // Post: Items on the list are printed on the screen.
  102. {
  103. 	NodeType* location = listPtr;
  104.  
  105. 	while (location != NULL)
  106. 		  { cout << location->item << endl;
  107. 	        location = location->next; }
  108. }
  109.  
  110. //***********************************************************
  111. int  List::Length() const
  112. // Post: Number of items have been counted; result returned.
  113. {
  114.     NodeType* location = listPtr;
  115. 	int length = 0;
  116.  
  117. 	while (location != NULL)
  118. 		  { location = location->next;
  119. 			length++; }
  120. 	return length;
  121. }
  122.  
  123. //***********************************************************
  124. List::~List()
  125. // Post: All the components are deleted.
  126. {
  127.     NodeType* tempPtr;
  128.  
  129. 	while (listPtr != NULL)
  130. 	{
  131. 		tempPtr = listPtr;
  132. 		listPtr = listPtr->next;
  133. 		delete tempPtr;
  134. 	}
  135. }
  136.  
  137.  
  138. int main ()
  139. {
  140. 	ifstream InData;
  141. 	InData.open ("int.dat");
  142. 	while (InData)
  143. 	{ List.Insert(InData); }
  144.     int length = List.Length();
  145. 	cout << "There are " << length << " many items in this list." << endl;
  146. 	List.Print();
  147.  
  148. 	system ("pause");
  149. 	return 0;
  150. }
Last edited by DemonGal711; Oct 8th, 2008 at 1:49 pm.
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Re: Parse Error Before 'else'

 
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  #4
Oct 8th, 2008
why are you passing an argument of type ifstream to List.insert() when it obviously expects an argument of the type "itemType" ?

I understand you have your items in a file, but do you expect the file to read itself ? You need to write some code to read the contents of the file and then pass the correct arguments to the insert function.
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Re: Parse Error Before 'else'

 
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  #5
Oct 8th, 2008
Okay, that's how I was told to write that part of the code so that's what I did. So, how should the code look then? I'm lost.
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Re: Parse Error Before 'else'

 
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  #6
Oct 8th, 2008
ok I am not sure what your itemType is so lets assume its a basic data type like int or string and your file has those in it.

so
C++ Syntax (Toggle Plain Text) 
  1.   itemType element; 
  2.  
  3.   ifstream InData;
  4.   InData.open ("int.dat");
  5.   if (inData.isopen()){
  6.     while (InData >> element){    
  7.       List.Insert(element); 
  8.     }
  9.   }
Last edited by stilllearning; Oct 8th, 2008 at 3:22 pm.
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