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Browse - programming tips - fast hex to int

Date: 2010nov25
Language: C/C++
Keywords: fast, speed, integer, hex, hexadecimal

Q.  How can I quickly convert a an ASCII hex number into an integer?

A.

// To convert a 1 digit hexadecimal ASCII number into an integer
inline int xtoi(const char c)
{
	if (isdigit(c))
	{
		return c - '0';
	}
	else
	{
		return tolower(c) - 'a' + 10;
	}
}

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