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The version of the analyze_trades program in
Segment 573 contains a wired-in character string supplied
when the analyze_trades program was written. Generally, you want a
way to have your program ask you for a file-specifying character string at
run time. Then, once you have supplied that file-specifying character
string, your program can read information from it.
You can, for example, include the following code, which leads to the
insertion of a file-specifying character string into the
input_buffer character array:
printf ("Please type the name of a trade file.\n");
scanf ("%s", input_buffer);
Next, you can use that file-specifying character string instead of wired-in character string:
analysis_target = fopen(input_buffer, "r");