Wolfram: Convert String

Convert number or any expression to string.

ToString

ToString[ 8.23 ] === "8.23"
(* True *)

ToString[ {1,2,3} ] === "{1, 2, 3}"
(* True *)

ToString[ Expand[(x^2/y^3 + y^2)^2] ]
(*
 4      2
x    2 x     4
-- + ---- + y
 6    y
y
*)

String to number.

ToExpression

ToExpression[ "3" ] === 3
(* True *)

ToExpression[ "3.21" ] === 3.21
(* True *)