If you try to make use of a variable that you have not declared, your program will not be compiled or else run, plus you will get an error note stating you that you have made a mistake. Generally, this is called an undeclared variable.
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Common Errors when Declaring Variables in C++ If you try to make use of a variable that you have not declared, your program will not be compiled or else run, plus you will get an error note stating you that you have made a mistake. Generally, this is called an undeclared variable.
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