diff --git a/src/readfloat.c b/src/readfloat.c
--- a/src/readfloat.c
+++ b/src/readfloat.c
#include <string.h>
#include <math.h>
+/*
+** Parses a string representation of a floating-point number.
+**
+** @param str The input string to parse.
+** @param endp A pointer to a char* that will be updated to point to the
+** character in str after the last character used in the
+** conversion. Can be NULL.
+** @param fp A pointer to a double that will be set to the parsed
+** floating-point number.
+** @return TRUE if a float is successfully parsed, FALSE otherwise.
+*/
MRB_API mrb_bool
mrb_read_float(const char *str, char **endp, double *fp)
{
while (ISSPACE((unsigned char)*p)) p++;
// Handle sign
- if (*p == '-') { sign = -1.0; p++; }
+ if (*p == '-') { sign = -1; p++; }
else if (*p == '+') p++;
// Parse integer part