Node:Mixed precision, Next:, Previous:Numeric comparison, Up:Arithmetic



Mixed precision


m+       d1 n -- d2        double       ``m-plus''

*/       n1 n2 n3 -- n4         core       ``star-slash''
n4=(n1*n2)/n3, with the intermediate result being double.
*/mod       n1 n2 n3 -- n4 n5         core       ``star-slash-mod''
n1*n2=n3*n5+n4, with the intermediate result (n1*n2) being double.
m*       n1 n2 -- d        core       ``m-star''

um*       u1 u2 -- ud        core       ``u-m-star''

m*/       d1 n2 u3 -- dquot         double       ``m-star-slash''
dquot=(d1*n2)/u3, with the intermediate result being triple-precision. In ANS Forth u3 can only be a positive signed number.
um/mod       ud u1 -- u2 u3        core       ``u-m-slash-mod''
ud=u3*u1+u2, u1>u2>=0
fm/mod       d1 n1 -- n2 n3        core       ``f-m-slash-mod''
Floored division: d1 = n3*n1+n2, n1>n2>=0 or 0>=n2>n1.
sm/rem       d1 n1 -- n2 n3        core       ``s-m-slash-rem''
Symmetric division: d1 = n3*n1+n2, sign(n2)=sign(d1) or 0.