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4.11.2 number expressions
A number expression is:
- a rational number (there are NO spaces allowed inside a rational number, see int expressions)
-
a floating point number (if the coefficient field is
real):
<digits>.<digits>e<sign><digits> - an identifier of type number
- a function returning number
- an int expression (see Type conversion and casting)
-
number expressions combined by the arithmetic operations
+,-,*,/,^, or**. - a type cast to number
Example:
// the following expressions are in any ring int expressions 2 / 3; → 0 4/ 8; → 0 2 /2; // the notation of / for div might change in the future → 1 ring r0=0,x,dp; 2/3, 4/8, 2/2 ; // are numbers → 2/3 1/2 1 poly f = 2x2 +1; leadcoef(f); → 2 typeof(_); → number ring rr =real,x,dp; 1.7e-2; 1.7e+2; // are valid (but 1.7e2 not), if the field is `real` → 1.700e-02 → 1.700e+02 ring rp = (31,t),x,dp; 2/3, 4/8, 2/2 ; // are numbers → 11 -15 1 poly g = (3t2 +1)*x2 +1; leadcoef(g); → (3t2+1) typeof(_); → number par(1); → (t) typeof(_); → number |