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553: Mainline

Once you have finished writing information into a file, you must close the file before you can open it for reading and further processing. The do-nothing, somewhat dangerous way to close your files is to wait until your program stops executing: At that point, your operating system is supposed to close all open files automatically. The safer way to close your files is to include an explicit file-closing statement, such as the following, which closes the output file associated with the analysis_target file pointer:

fclose (analysis_target);