Simple casting problem

As far as I know, no standard functions begin with a "_", and I think I read somewhere that you should never define things beginning with "_" because they could clash with implementation specific variables, functions, macros, classes...

There is both itoa and _itoa, while the doc says _itoa is the ISO standard and itoa is deprecated in VC++ 2005.

Quote:

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Originally Posted by Elysia

There is both itoa and _itoa, while the doc says _itoa is the ISO standard and itoa is deprecated in VC++ 2005.

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You can still use the non _ version of all those "deprecated" functions.
If/when they force you to call their _ version, I would just redefine them all myself:

Code:

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#ifdef WIN32
#  define open  _open
#  define O_APPEND  _O_APPEND
#  define O_BINARY  _O_BINARY
...
#endif

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Here MS attributes itoa() as POSIX, which is also wrong.

As far as I can tell, itoa() doesn't belong to any standard at all.
It isn't in this list of POSIX functions.

You're simply better off avoiding it altogether.

this came from the reverse of atoi.. intuitive for ppl who already know atoi as its mostly used
long ago I had the same prob..
but after googling itoa is not a standard but implemented in few compilers and headers as macro(mostly for windows)..
spritnf is better and standard.

got another question now ... noob as I am ...

What if I want to convert back from a char to int again. my code

Code:

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char buf[] = "10";
int a;

a = ??

a = buf[0];//gives the ascii code for 1
a = buf[1];//gives the ascii code for 0

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How do I get a to 10?

Use atoi, if such a function exists.

Or strtol() would be better, it has improved error diagnostics.

sscanf() will also work.