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explicit type conversion

explicit type conversion in Technology

(Or "cast" in C and elsewhere). A programming construct (syntax) to specify that an expression's value should be converted to a different type.
For example, in C, to convert an integer (usually 32 bits) to a char (usually 8 bits) we might write:
int i = 42; char *p = &buf; *p = (char) i;
The expression "(char)" (called a "cast") converts i's value to char type. Casts (including this one) are often not strictly necessary, due to automatic coercions performed by the compiler, but can be used to make the conversion obvious and to avoid warning messages.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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