When defining objects of class templates, the data type you wish to pass into the type parameter must be specified.
The specification for creating classes based on parameters is provided by a class template. Container implementation typically makes use of class templates.
A variable's data type and the kinds of mathematical, relational, and logical operations that can be performed on it without producing an error are classified as data types in programming.
Integers, floating point numbers, characters, strings, and arrays are a few examples of typical data types. In addition, they might be more specialized types like dates, timestamps, boolean values, and varchar (variable character) formats.
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