Is node* pre-defined datatype in c++.
If yes then it’s ok but if not then how we are using node* datatype without defining it ?
Doubt in linked list
no it is not,
see we are defining a class called node, which will have some data and a pointer that will point to anothoer node of similar data type.
thats why we have written this
node * next ; // this indicates that next is a ponter that will point to a list Node whose data type is node.
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Ok now it’s clear 
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