• string to float

const float string_to_float_table[17] = 
{
	0.f,
	0.1f,
	0.01f,
	0.001f,
	0.0001f,
	0.00001f,
	0.000001f,
	0.0000001f,
	0.00000001f,
	0.000000001f,
	0.0000000001f,
	0.00000000001f,
	0.000000000001f,
	0.0000000000001f,
	0.00000000000001f,
	0.000000000000001f,
	0.0000000000000001f,
};
inline float string_to_float(const char16_t* str, size_t len)
{
	assert(str);
	float result = 0.f;
	bool is_negative = *str == u'-';

	if(is_negative)
		++str;

	int i = 0;
	while(*str >= u'0' && *str <= u'9')
	{
		i *= 10;
		i += *str - u'0';
		++str;
	}
	result = (float)i;
	
	i = 0;

	if(*str == u'.')
		++str;

	int part_2_count = 0;
	while(*str >= u'0' && *str <= u'9')
	{
		i *= 10;
		i += *str - u'0';
		++str;
		++part_2_count;
	}
	result += (float)i * string_to_float_table[part_2_count];

	return is_negative ? -result : result;
}