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isspace()                Test for White-Space Character

 #include   <ctype.h>

 int        isspace(c);
 int        c;                           Integer value to be tested

    isspace() tests if 'c' is a white-space character; that is, a
    horizontal tab, a new-line, a vertical tab, a form-feed, a
    carriage-return or a space.

    Returns:    True (nonzero) if the integer satisfies the test
                condition or false (zero) if it does not.  The result is
                undefined if 'c' is other than an ASCII character or EOF.

      Notes:    isspace() is a macro.

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

    The following statements read characters from a file and put each
    word (characters set off by a space) on a separate line.


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

         FILE *stream;
         int ch;
         int x = 0;

         main()
         {
              if ((stream = fopen("data.txt","r+")) != NULL) {
                 while (!feof(stream))
                     if(isspace(ch = getc(stream))) {
                            fputchar('\n');
                            x = 0;
                     }
                     else
                            fputchar(ch);
              }
          }