toUpper/Lower one line function

closed account (zwA4jE8b)
I was doing an exercise and came up with a one line function for toUpper/Lower.

Just wanted to show everyone. Granted there is no validation on this. I guess just making sure the value of the ch is 65-90 or 97-122.

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#include <iostream>

using namespace std;

char toUpper(char ch);
char toLower(char ch);

int main()
{
	cout << "This program uses an XOR mask to convert\n" <<
		"a character toUpper or toLower. The mask is\n" <<
		"00100000b or 0x20h.  This works because the\n" <<
		"5th bit is changed. 1 to 0 for toLower\n" <<
		"and 0 to 1 for toUpper.\n" << endl;

	cout << "toLower...." << endl;
	for (int i = 65; i <= 90; i++)
		cout << static_cast<char>(i) << " toLower is: " << toLower(i) << endl;

	cout << endl;

	cout << "toUpper...." << endl;
	for (int i = 97; i <= 122; i++)
		cout << static_cast<char>(i) << " toUpper is: " << toUpper(i) << endl;

	cout << endl << "Press ENTER to continue...";
	cin.get();
	return 0;
}

char toUpper(char ch)
{
	return (ch ^ 0x20);
}

char toLower(char ch)
{
	return (ch ^ 0x20);
}
kbw (9488)
closed account (zwA4jE8b)
Nice reading, now I have to try to write code for those functions as well.

updated code thread... http://cplusplus.com/forum/general/36127/
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