6.5.1 Single precision ¶

By default, numbers in Forth are single-precision integers that are one cell (a machine word, e.g., 64 bits on a 64-bit system) in size. They can be signed or unsigned, depending upon how you treat them. For the rules used by the text interpreter for recognising single-precision integers see Literals.

+, 1+, under+, -, 1-, * are defined for signed operands, but they also work for unsigned numbers. For division words see Integer division.

+ ( n1 n2 – n ) core “plus”

1+ ( n1 – n2 ) core “one-plus”

under+ ( n1 n2 n3 – n n2 ) gforth-0.3 “under-plus”

add n3 to n1 (giving n)

- ( n1 n2 – n ) core “minus”

1- ( n1 – n2 ) core “one-minus”

* ( n1 n2 – n ) core “star”

negate ( n1 – n2 ) core “negate”

abs ( n – u ) core “abs”

min ( n1 n2 – n ) core “min”

max ( n1 n2 – n ) core “max”

umin ( u1 u2 – u ) gforth-0.5 “umin”

umax ( u1 u2 – u ) gforth-1.0 “umax”