#include <stdio.h>
    #define  CONDITION	1
    main()  {
      char  str[]="C Programing", c;
      int   i=0;
      while((c=str[i])!='\0')  {
	    i++;
	    #if CONDITION
	    if(c>='a'&&c<='z')
	      c=c-32;
	    #else
	      if(c>='A'&&c<='Z')
	      c=c+32;
	    #endif
	    printf("%c",c);
      }
    }