Modern C++ for Absolute Beginners: A Friendly Introduction to the C++ Programming Language and C++11 to C++23 Standards

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

S. DmitrovićModern C++ for Absolute Beginnershttps://doi.org/10.1007/978-1-4842-9274-7_14

14. Automatic Type Deduction

Slobodan Dmitrović¹  

(1)

Belgrade, Serbia

 

We can automatically deduce the type of an object using the auto specifier. The auto specifier deduces the type of an object based on the object’s initializer type.

Example:

auto c = 'a';    // char type

This example deduces c to be of type char as the char literal 'a' is of type char.

Similarly, we can have

auto x = 123;    // int type

Here, the compiler deduces the x to be of type int because an integer literal 123 is of type int.

The type can also be deduced based on the type of the expression:

auto d = ...