pointers - What is the size and lifetime of a node in a linked-list implementation in C? -

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in linked-list implementation in c (or c++), size of node , lifetime of pointer variable? example: 

struct node {   int data;   struct node *next; }*ptr=null;

now want know size of node: 4 bytes, , if so, how? secondly, how long pointer live: throughout execution of program? lastly, proper call *ptr instance variable or data member or object?

sizeof compile time operation . node structure . size of node summation of members size in structure . u have integer , pointer . size of node size of integer + size of pointer . lifetime : memory allocated dynamically . until call free , node lives . if u perform delete operation , programmer style used free memory allocated node .


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