/* converts case of standard input to upper or lower, depending upon
 * the name the program was invoked with, and prints the results on
 * standard output.
 */

#include <stdio.h>
#include <ctype.h>

int main(int argc, char *argv[]) {
     char c;

     while (!isalpha(*argv[0]) && *argv[0] != '\0')
	  argv[0]++;
     if (strcmp(argv[0], "upper") == 0)
	  while ((c=getchar()) != EOF)
	       putchar(toupper(c));
     else if (strcmp(argv[0], "lower") == 0)
	  while ((c=getchar()) != EOF)
	       putchar(tolower(c));
     else
	  while ((c=getchar()) != EOF)
	       putchar(c);

     if (c != '\n')
	  putchar('\n');

     return 0;
}