C++ Primer, Fifth Edition

2.1.2. Type Conversions

The type of an object defines the data that an object might contain and what operations that object can perform. Among the operations that many types support is the ability to convert objects of the given type to other, related types.

Type conversions happen automatically when we use an object of one type where an object of another type is expected. We’ll have more to say about conversions in § 4.11 (p. 159), but for now it is useful to understand what happens when we assign a value of one type to an object of another type.

When we assign one arithmetic type to another:

bool b = 42;            // b is trueint i = b;              // ...