Toggle a Bit

//	ToggleBit(value, bitNumber)
//	Examples:
//		Printf "0x%X\r", ToggleBit(0xFFFF,0)		// Prints 0xFFFE
//		Printf "0x%X\r", ToggleBit(0xFFFE,0)		// Prints 0xFFFF
//	Requires Igor Pro 7.00 or later.
Function ToggleBit(int value, int bitNumber)
	int bitMask = 1 << bitNumber		// << requires Igor Pro 7 or later
	
	if ((value & bitMask) != 0)
		// Bit is set - clear it
		value = value & ~bitMask
	else
		// Bit is cleared - set it
		value = value | bitMask
	endif
	
	return value
End