String deskFileName is a file's name read from input, and is opened as an input file. If inFS.is$\_$open$()$ returns false, then:

Output deskFileName followed by $"$: file error causing program to terminate" 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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Ex $1$: If the input is data$3.$txt and:

Contents of file data$3.$txt

$81$

then the output is:

$81$

Ex $2$: If the input is data$7.$txt$,$ then the output is:

data$7.$txt: file error causing program to terminate