How to convert unsigned long to string

Question

In the C language, how do I convert unsigned long value to a string (char *) and keep my source code portable or just recompile it to work

Answer 1

Try using sprintf:

unsigned long x=1000000;
char buffer[21];
sprintf(buffer,"%lu", x);

Edit:

Notice that you have to allocate a buffer in advance, and have no idea how long the numbers will actually be when you do so. I'm assuming 32bit longs, which can produce numbers as big as 10 digits.

See Carl Smotricz's answer for a better explanation of the issues involved.