#include <stdlib.h> long double _strtold(const char *s, char **endp);
This function converts as many characters of s that look like a floating point number into one, and sets *endp to point to the first unused character.
The value the string represented.
not ANSI, not POSIX
char *buf = "123ret"; char *bp; long double x = _strtold(buf, &bp);
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