char mystring[] ="CSc 116, Low Level Programming Language";

/* C program to demonstrate bitwise operations
	&  AND
	|  Inclusive OR
	^  Exclusive OR (XOR)
	~  NOT  (note use for AND mask, flipping all bits)
   Lin Jensen
   23 October 2006
   22 February

   3 new versions of the string will be printed
	all upper case
	all lower case
	case reversed
*/

#include <stdio.h>

int main()
{
	char caps[40];
	char lowc[40];
	char goofy[40];
	char *orig = mystring;
	char *up = caps;
	char *down = lowc;
	char *chg = goofy;

	char ch;
    do
    {
	ch = *orig++;
	if (ch >='A')		/* assume letter */
	{   *up++   = ch & ~0x20; /* 0xdf; AND case bit 0 for upper case*/
	    *down++ = ch | 0x20;  /* OR, case bit 1  for lower case*/
	    *chg++  = ch ^ 0x20;  /* XOR flips case bit */
	}
	else			/* just copy */
	{   *up++   = ch;
	    *down++ = ch;
	    *chg++  = ch;
	}
    } while (ch);
    puts(mystring);		/* print each string as a line */
    puts(caps);
    puts(lowc);
    puts(goofy);

   return 0;
}