2008年10月10日 · itoa() is a really handy function to convert a number to a string. Linux does not seem to have itoa(), is there an equivalent function or do I have to use sprintf(str, "%d", num)?

The name itoa is kind of already taken for a function that's non-standard, but not that uncommon. It doesn't allocate memory, rather it writes to a buffer provided by the caller: char *itoa(int value, char * str, int base); If you don't want to rely on your platform having that, I would still advise following the pattern.

2009年10月19日 · If _CRT_NONSTDC_NO_WARNINGS is defined, the MS compiler won't complain about the itoa() function being deprecated. But it will still complain about it being unsafe (you have to define _CRT_SECURE_NO_WARNINGS to quiet that warning). Or use the safer version of the function (_itoa_s()) that provides the function with the destination buffer size

The C++ to_string() method does not replicate the full functionality of C's itoa as it cannot deal with arbitrary bases. A little confusing why this functionality wouldn't have been included, especially considering that the inverse function stoi() can handle arbitrary bases.

2014年2月1日 · fputc(itoa(size, tempBuffer, 10), saveFile); and I receive this warning and message: warning: implicit declaration of 'itoa' undefined reference to '_itoa' I've already included stdlib.h, and am compiling with: gcc -Wall -pedantic -ansi …

2017年10月31日 · The first step to optimizing your code is getting rid of the arbitrary base support. This is because dividing by a constant is almost surely multiplication, but dividing by base is division, and because '0'+n is faster than "0123456789abcdef"[n] (no memory involved in the …

2011年3月9日 · Before I continue, I must warn you that itoa is NOT an ANSI function — it's not a standard C function. You should use sprintf to convert an int into a string. itoa takes three arguments. The first one is the integer to be converted. The second is a pointer to an array of characters - this is where the string is going to be stored.

The comment to rename it is just to bring the function name in line with C / C++'s naming conventions with regards to proceeding underscores _itoa preferred over itoa; but, in either case, the existence of a itoa function in either case is not standard C, even if it is common. It is compiler dependent, and the kind of code that needs rewritten ...

2013年4月15日 · @Fayeure Yes. This was offered as a solution to the OP's question: how to implement itoa recursively. In order for the calling function to alter control flow, state needs to be passed between caller and callee.

2012年1月10日 · in addition itoa() is non standard, so i prefer to use the standard sprintf(d,"%d",num); and as said in the comment below, if you dont need char* and you can use std::string . use string d = std::to_string(num);