Modern C++ for Absolute Beginners: A Friendly Introduction to C++ Programming Language and C++11 to C++20 Standards

© Slobodan Dmitrović 2020

S. DmitrovićModern C++ for Absolute Beginnershttps://doi.org/10.1007/978-1-4842-6047-0_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 initializer '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 expression:

auto d = 123.456 / 789.10;    // double

This example deduces d to be of type double ...