# strfromf, strfromd, strfromld

From cppreference.com
< c‎ | string‎ | byte

Defined in header `<stdlib.h>` |  |
int strfromf( char *restrict s, size_t n, const char *restrict format, float fp ); |  | (since C23)
int strfromd( char *restrict s, size_t n, const char *restrict format, double fp ); |  | (since C23)
int strfroml( char *restrict s, size_t n, const char *restrict format, long double fp ); |  | (since C23)

Converts a floating-point value to a byte string.

The functions are equivalent to snprintf(s, n, format, fp), except that the format string shall only contain the character %, an optional precision that does not contain an asterisk *, and one of the conversion specifiers `a`, `A`, `e`, `E`, `f`, `F`, `g`, or `G`, which applies to the type double, float, or long double) indicated by the function suffix (rather than by a length modifier). Use of these functions with any other format string results in undefined behavior.

### Parameters

s | - | pointer to a character string to write to
n | - | up to n - 1 characters may be written, plus the null terminator
format | - | pointer to a null-terminated byte string specifying how to interpret the data
fp | - | floating-point value to convert

### Return value

The number of characters that would have been written had `n` been sufficiently large, not counting the terminating null character. Thus, the null-terminated output has been completely written if and only if the returned value is both nonnegative and less than `n`.

### Example

| This section is incomplete Reason: no example

### Reference

- C23 standard (ISO/IEC 9899:2023):

  - 7.24.1.3 The strfromd, strfromf, and strfroml functions

### See also

printf fprintf sprintf snprintf printf_s fprintf_s sprintf_s snprintf_s (C99)(C11)(C11)(C11)(C11) | prints formatted output to stdout, a file stream or a buffer (function)
strtof strtod strtold (C99)(C99) | converts a byte string to a floating point value (function)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=c/string/byte/strfromf&oldid=147291"