static double parse_decimal(const char *str, char **endptr)
{
double result = 0, d = 1;
result += parse_number(str, endptr);
if (**endptr == '.')
{
++(*endptr);
while (isdigit(**endptr)) ++(*endptr), d *= 10;
result += digits_to_num(*endptr - 1) / d;
}
return result * parse_e_format(*endptr, endptr);
}
static bool cancel_digit (int nom, int denom, int N) {
int nom_digits[N];
int denom_digits[N];
fill_digits (nom_digits, nom);
fill_digits (denom_digits, denom);
bool nom_trailing_zero = true;
for (int i = 0; i < N; i++) {
if (nom_digits[i] != 0)
nom_trailing_zero = false;
if (nom_trailing_zero)
continue;
bool denom_trailing_zero = true;
for (int j = 0; j < N; j++) {
if (denom_digits[j] != 0)
denom_trailing_zero = false;
if (denom_trailing_zero)
continue;
if (nom_digits[i] == denom_digits[j]) {
int new_nom = digits_to_num (nom_digits, N, i);
int new_denom = digits_to_num (denom_digits, N, j);
if (nom * new_denom == denom * new_nom)
return true;
}
}
}
return false;
}
static double parse_number(const char *str, char **endptr)
{
while (isdigit(*str)) ++str; /* Pointer to the end of the parsed part. */
*endptr = (char*)str--;
return digits_to_num(str);
}
