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What you have learned about defining integer pointers applies to defining structure-object pointers as well:
struct trade t; /* Allocate space for a trade */ struct trade *tptr; /* Allocate space for a pointer to a trade */
The definition, struct trade *tptr; makes tptr a pointer
variable, and the chunk of memory allocated for tptr contains the
address of a chunk of memory allocated for a trade object.
Thereafter, tptr, without a dereferencing asterisk, refers to the
location of the address; *tptr, with a dereferencing asterisk,
refers to the location of the trade object identified by the
address. Said more concisely, tptr's value is an address, whereas
*tptr's value is a trade object.