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ungetc

Usage

   #include <stdio.h>
   int ungetc(int c,FILE *fp);

   ANSI

Description

   Puts character c back into the input stream fp, where it is read by the
   next input operation on the stream. If an fseek is done between an ungetc
   and the next read, then the ungotten character is lost. Only one
   character may be put back between reads. EOF cannot be ungotten.

Example 

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

   int main()
   {
       char ch;
       FILE *stream;
       stream = fopen("file.dat","r");
       while((ch = fgetc(stream)) != EOF)
           if(isspace(ch))
               break;
       ungetc(ch,stream);
       ch = fgetc(stream);
       fclose(stream);
       return EXIT_SUCCESS;
   }

Return Value

   ungetc returns c if successful and returns an EOF if the character cannot
   be pushed back.

See Also

   getc, getchar, putc, putchar