Miscellany

#include <stdio.h>

int main(void)
{
  int c;
  while ((c = getchar()) != EOF)
  {
    if (c > 33 && c < 58)
      c = c + 32;
    printf ("The character is %c \n",c);
    else if (c < 90 && c > 65)
      c = c - 32;
    printf ("The character is %c \n",c);
    else
      printf (" Incorrect input\n");
  }
  return 0;
}