Hi Ben, On Sat, Oct 16, 2010 at 12:40:36PM +0100, Benjamin Czaczkes wrote: > this is the message I get > D:\Doc\2011\76635\proj\Q1\main.cpp:9: error: 'to_string' is not a member of 'std' This message tells you, that you try to access a function / variable "to_string" from the namespace "std", but which is not known to the compiler when the compiler reads your file. Probably the error is that you did not include a necessary header file (which contains the declaration of this function)? Beside that: I don't know a function "to_string" defined in the standard library -- maybe you wanted to call the member function "to_string" of a bitset? Then (for a bitset "b") you would have to write "b.to_string()" instead. Could you provide a full compilable example (as short as possible) of your code, which reproduces the error? Then we can really tell whether it is a mistake in your code oder in g++ or.... Axel
