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 putc()                  Write a Character to Stream (Macro)

 #include   <stdio.h>

 int putc(c,stream);
 int        c;                           Character to be written
 FILE       *stream;                     Pointer to the FILE stream

    putc() is a macro that writes one character, 'c', to the output
    'stream' at the current position.

    Returns:    If successful, putc() returns the character written.
                putc() returns the value of EOF to indicate an error.
                EOF is a legitimate integer value, however, so ferror()
                should be used to detect errors on the given 'stream'.

      Notes:    putc() performs the same operation as fputc(), but putc()
                is a macro, while fputc() is a function.

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

    This example writes the letters of the alphabet to a file, checks for
    a write error, then closes the file.

           #include <stdio.h>

           FILE *out;
           int x;

           main()
           {
               if ((in = fopen("alph.dat","w+")) != NULL) {
                  for (x = 65; x < 91; x++) {
                      putc(x,in);
                      if(ferror(in))
                         printf("write error");
                   }
                   fclose(in);
                }
           }