a C question | GameDev.net

Original Post

Sep 1, 2003 at 10:50 PM

I got this question in an entrance test for a game programming skool, and I was extremely stuck on how to do it... Write a function to flip bit 7 of a char (eg. If I have the value 35 – which in binary is: 00100011 and I flip bit 7 it should become 10100011 – or 163 and if I flip bit 7 of 163 it would become 35). any ideas?

tortoise

Sep 1, 2003 at 11:05 PM


unsigned char flip(unsigned char c) {
	static unsigned char a = 1 << 7;
	
	return c ^ a;
}

that's exclusive or, not used too often.

[edited by - tortoise on September 1, 2003 12:06:37 AM]

dinotoast

Sep 1, 2003 at 11:18 PM

thanks heaps!

i''ll remeber that for next time

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