Numbers may be integer or floating-point. Arithmetic operations with integer numbers that yield an integer result will produce an integer number. Arithmetic operations which involve floating-point numbers will return a floating-point number. In this way, integer numbers may be considered precise.

Yewslip> print 1 - 5 * 3
-14

Yewslip> print 17 / 2
8.5

Yewslip> print .2 * 3
0.6

If an integer number overflows, that is, if it is too large for the integer type, it is converted into a floating-point number. If a floating-point number overflows, it is converted into infinity.