Question: I am writing a c++ program called pca that is supposed to read data from a file. I am supposed to run it by using

I am writing a c++ program called pca that is supposed to read data from a file. I am supposed to run it by using ./pca < (filename) on the command line. My question is how am I supposed to get the file name if I need it? I know I can cin the text but I need to pass the file to a function within the program as well.

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