using delete and free

This is a discussion on using delete and free within the C Programming forums, part of the General Programming Boards category; i am unable to use "delete" and "free" on dev shed c++. i wonder whether its related to some header ...

  1. #1
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    Unhappy using delete and free

    i am unable to use "delete" and "free" on dev shed c++. i wonder whether its related to some header file. please help.

  2. #2
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    Can you post the simplest example which demonstrates the problem, and the exact error message you are getting?
    bit∙hub [bit-huhb] n. A source and destination for information.

  3. #3
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    heres the program

    Code:
    /*c program to represent a queue as a singly linked list*/
    
    #include<stdio.h>
    #include<conio.h>
    #include<stdlib.h>
    
    struct node
    {
         int data;
         struct node *link;
    };
    
    typedef struct node node;
    
    void buildQueue(node *,int );
    void display(node *);
    void deleteQueue(node *);
    
    int main()
    {
         node *start;
         start=NULL;
         buildQueue(start,10);
         buildQueue(start,20);
         buildQueue(start,30);
         buildQueue(start,40);
         
         display(start);
     
         deleteQueue(start);
         deleteQueue(start);
    
         display(start);
    
         getch();
         return 0;
    }
    
    void buildQueue(node *root,int data)
    {
          node *newnode;
          newnode=(node *)malloc(sizeof(node));
          newnode->data=data;
          newnode->link=NULL;
          if(root==NULL)
          {
                root=newnode;
          }
          else
          {
                newnode->link=root;
                root=newnode;
          }
    }
    
    void display(node *root)
    {
         while(root!=NULL)
         {
               printf("%d",root->data);
               root=root->link;
         }
    }
    
    void deleteQueue(node *root)
    {
          node *temp,*prev;
          temp=root;
          while(temp->link!=NULL)
          {
                temp=temp->link;
                prev=temp;
          }
          prev->link=NULL;
          delete temp;
    }
    i get 2 error messages in line number 75:"delete"undeclared and syntax error before"temp"

  4. #4
    C++ Witch laserlight's Avatar
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    Eh, delete, as used in this context, is a C++ keyword, not C.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  5. #5
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    Code:
    void deleteQueue(node *root)
    {
          node *temp,*prev;
          temp=root;
          while(temp->link!=NULL)
          {
                temp=temp->link;
                prev=temp;
          }
          prev->link=NULL;
          delete temp;                  <--- free(temp);
    }

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