Summary
To get the data type of a variable in C++, use the typeid(x).name() function from the typeinfo library. This function returns the type name of the variable as a string.
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For example, if the variable is an integer, the function will return "int".
It is also possible to use the typeid(x).hash_code() function to get the hash code of the type of the variable.
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That's fine. It'll work until he has to port his code and then he'll find all his type field is wrong and will have to recode all his data or hack is program.
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