Given an array of more than 512 points, respectively, show the spectrum of their properties for fft and display frequency and amplitude coordinates (you can choose an array of interface controls, set the sampling time)

fft\data.txt
...\fft
...\fft.pro
...\fftmainform.cpp
...\fftmainform.h
...\fftmainform.o
...\fftmainform.ui
...\fftmainform.ui.h
...\fftmainform.ui.h~
...\fftmainform.ui~
...\images\l.png
...\main.cpp
...\main.o
...\Makefile
...\moc_fftmainform.cpp
...\moc_fftmainform.o
...\qmake_image_collection.cpp
...\qmake_image_collection.o
...\images
fft

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