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If you want to store the appropriate trade-describing string with each new
structure object, you need to create a character array to store that
description. You cannot just use the input_buffer array, because
that array is reused repeatedly, once for each trade-describing string
read. Fortunately, you can allocate space for new arrays just as you can
allocate space for new structure objects. In fact, you use the same
operator, malloc. Thus, the following allocates enough bytes to
hold the five characters in the string "C-IBM" plus a terminating null
character:
malloc (6)