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ungetch()                Push Back the Last Character Read from the Console

 #include   <conio.h>                    Required for declarations only

 int        ungetch(c);
 int        c;                           Character to be pushed

    ungetch() pushes back 'c', the last character read from the console.
    'c' will then be the next character read.  ungetch() can only be
    called once between read statements.

    Returns:    The character 'c' if successful.  A return value of EOF
                indicates an error.

  -------------------------------- Example ---------------------------------

    The following statements get digits and alphabetic characters from
    the console.

         #include <conio.h>
         #include <ctype.h>

         char item[80];
         char qty[5];
         int x, y;
         char ch;

         main()
         {
             while (isdigit(ch = getche()))
                   qty[y++] = ch;
             /* process 'qty' */
             if (isalpha(ch))
                ungetch(ch);
             while (isalpha(ch = getche()))
                   item[x++] = toupper(ch);
             /* process 'item' */
             printf("\n%s %s\n",qty,item);
          }