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I believe you are referring to uninitialised variables, although it's hard to tell from the wording of the question.

If you attempt to print the value of an uninitialised variable, the behaviour is undefined.

Typically, when a variable is uninitialised, the memory to which the variable is allocated will be left unchanged; it will hold whatever value happened to exist there at the point the variable was instantiated. However, only local variables (allocated on the stack) and dynamic variables (allocated on the heap) are uninitialised by default. Static variables are zero-initialised by default and object variables are always initialised according to whichever class constructor was invoked at the point of instantiation.

Most compilers will detect attempts to use uninitialised local variables and will emit warnings to that effect during compilation.

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Q: When posting variables if you do not value the variable then you want to display the variable value. What is going on Explain?
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