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Write a function to delete a specified node.

Write a function to delete a specified node.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Example 13.5 Write a function to delete a specified node. A function to delete a specified node is given in Fig.13.9. The function first checks whether the specified item belongs to the first node. If yes, then the pointer to the second node is temporarily assigned the pointer variable p, the memory space occupied by the first node is freed and the location of the second node is assigned to head. Thus, the previous second node becomes the first node of the new list. If the item to be deleted is not the first one, then we use the find function to locate the position of "key node' containing the item to be deleted. The pointers are interchanged with the help of a temporary pointer variable making the pointer in the preceding node to point to the node following the key node. The memory space of key node that has been deleted if freed. The figure below shows the relative position of the key node. key node n1 n1->next n1->next->next The execution of the following code deletes the key node. p = n1->next->next; free (n1->next); n1->next = p; n1->next key node n1
Transcribed Image Text:Example 13.5 Write a function to delete a specified node. A function to delete a specified node is given in Fig.13.9. The function first checks whether the specified item belongs to the first node. If yes, then the pointer to the second node is temporarily assigned the pointer variable p, the memory space occupied by the first node is freed and the location of the second node is assigned to head. Thus, the previous second node becomes the first node of the new list. If the item to be deleted is not the first one, then we use the find function to locate the position of "key node' containing the item to be deleted. The pointers are interchanged with the help of a temporary pointer variable making the pointer in the preceding node to point to the node following the key node. The memory space of key node that has been deleted if freed. The figure below shows the relative position of the key node. key node n1 n1->next n1->next->next The execution of the following code deletes the key node. p = n1->next->next; free (n1->next); n1->next = p; n1->next key node n1
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