Converting between number types

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When converting from a floating point number to an integer there is likely to be a loss of precision - for example 3.1 will become 3.

When converting from an integer to a floating point there is no such danger.

integer to floating point

Not much can go wrong. The conversion is automatic.

However notice:

  • the calculation i/10 is performed as an integer
calculation and gives 123.0
  • the calculation i/10.0 is performed as a floating point calculation
and gives 123.4

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Rounding to an integer

We can use Math.round to convert a double to a long or a float to an int.

We can recast explicitly and have the fractional part of the number discarded.

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