_ltoa, _ltow

Artigo
07/22/2011

Converts a long integer to a string. More secure versions of these functions are available; see _ltoa_s, _ltow_s.

char *_ltoa(
   long value,
   char *str,
   int radix 
);
wchar_t *_ltow(
   long value,
   wchar_t *str,
   int radix 
);
template <size_t size>
char *_ltoa(
   long value,
   char (&str)[size],
   int radix 
); // C++ only
template <size_t size>
wchar_t *_ltow(
   long value,
   wchar_t (&str)[size],
   int radix 
); // C++ only

Parameters

value
Number to be converted.
str
String result.
radix
Base of value.

Return Value

Each of these functions returns a pointer to str. There is no error return.

Remarks

The _ltoa function converts the digits of value to a null-terminated character string and stores the result (up to 33 bytes) in str. The radix argument specifies the base of value, which must be in the range 2 – 36. If radix equals 10 and value is negative, the first character of the stored string is the minus sign (–). _ltow is a wide-character version of _ltoa; the second argument and return value of _ltow are wide-character strings. Each of these functions is Microsoft-specific.

Security Note
To prevent buffer overruns, ensure that the str buffer is large enough to hold the converted digits plus the trailing null-character and a sign character.

In C++, these functions have template overloads. For more information, see Secure Template Overloads.

Generic-Text Routine Mappings

Tchar.h routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_ltot	_ltoa	_ltoa	_ltow

Requirements

Routine	Required header
_ltoa	<stdlib.h>
_ltow	<stdlib.h>

For more compatibility information, see Compatibility in the Introduction.

Example

See the example for _itoa.

.NET Framework Equivalent

System::Convert::ToString

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