Question: C + + String dataFileName is a file's name read from input, and is opened as an input file. If dataFs.is _ open ( )

C++
String dataFileName is a file's name read from input, and is opened as an input file. If dataFs.is_open () returns false, then:
Output dataFileName followed by ": could not be opened" and a newline.
Terminate the program with the return value 1, so that the program does not proceed to read the file.
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main.cpp
data1.txt
data2.txt
data3.txt
C + + String dataFileName is a file's name read

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