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Once you open a file for input, you must switch from scanf to
fscanf, an acronym for file scan field.
The fscanf function takes an additional argument, a file pointer,
and reads from the file associated with the file pointer instead of from
your keyboard. Thus, unlike scanf, fscanf knows about the
structure variables in the structures created by fopen, and
fscanf uses that knowledge to get at the information in a file.
For example, the following statement tells C to read a floating-point
price and an integer number from the file identified by the
trade_source pointer:
fscanf (trade_source, "%f%i", &price, &number);