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What is the difference between declaration and definition? 

Posted in Data Structure Interview Questions

DECLARATION : declaration only creates the variable name and nothing exists against it. i.e no memory space is consumed.

eg. extern a;

DEFINITION : definition declares as well as assigns some value to the variable.

eg. int a;

even though we are not mentioning any value default value is provided by the C compiler.

eg. int a=10;

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