C typecasting question...

Gravity · 2002-06-03T09:09:34+00:00

If I cast from a double to float, how is the conversion performed? Is the double just truncated to make it a float?

It''s just copied to the destination and then rounded up or down. Look at this example:


float Float = 0f;
double Double = 3.1234567891234f;
Float = Double;

The maximum number of digits after the comma a float can hold is 5. When the line "Float = Double" is executed, the variable Double is truncated to 6 digits after the comma, and then rounded to 5 digits. So the value of Float becomes 3.12346.

Spartacus

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