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## 6. Conversions

A conversion enables an expression to be treated as being of a particular type. A conversion may cause an expression of a given type to be treated as having a different type, or it may cause an expression without a type to get a type. Conversions can be implicit or explicit, and this determines whether an explicit cast is required. For instance, the conversion from type `int` to type `long` is implicit, so expressions of type `int` can implicitly be treated as type `long`. The opposite conversion, from type `long` to type `int`, is explicit and so an explicit cast is required.

int a = 123;long b = a;       // Implicit conversion from int to longint c = (int) b;  // Explicit conversion from long to int

Some conversions are defined by the ...

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