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Implicit type conversion

Implicit type conversion

Oct 30 2010

Implicit type conversion, also known as "coercion", is an automatic type conversion by the compiler. Implicit conversions do not require any operator. They are automatically performed when a value is copied to a compatible type. In a mixed type expression, a subtype s will be converted to a supertype t or some subtypes s1, s2, ... will be converted to a supertype t (maybe none of the s{i} is of type t) at runtime so that the program will run correctly. For example:

double d;
long l;
int i;
if (d > i)
  d = i;
if (i > l)
  l = i;
if (d == l)
  d *= 2;

Although d, l and i belong to different datatypes, they will be automatically converted to the same datatype each time a comparison or assignment is executed.

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