Declaration of a variable in C hints the compiler about the type and size of the variable in compile time. Similarly, declaration of a function hints about type and size of function parameters. No space is reserved in memory for any variable in case of declaration. Example: int a; Here variable \’a\’ is declared of data type \’int\’ Defining a variable means declaring it and also allocating space to hold it. We can say \”Definition = Declaration + Space reservation\”. Example: int a = 10; Here variable \”a\” is described as an int to the compiler and memory is allocated to hold value 10.
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