Hi, Just for fun, to see how Smalltalk handles precision, 1000 decimals of pi in 10 lines of code. (arctan is redefined not to use floats, change 1000 to 100 for quick result, any variations welvome) in a workspace: | arctan pi | "arctan(x) using Taylor formula" arctan := [ :x :n | | r s | "x must be a fraction- n is the length of the serie" r := (0 to: n) inject: 0 into: [ :sum :k | sum + ((-1 raisedTo: k) * ( x raisedTo: ((2*k) + 1)) / ((2*k) +1)) ] . r ]. "pi using Machin formula" pi := (16* (arctan value: (1/5) value: 1000)) - (4*(arctan value: (1/239) value: 1000) ) asScaledDecimal: 1000. pi inspect. Cheers Alain