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Task/File-input-output/Scheme/file-input-output.ss

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+; Open ports for the input and output files
+(define in-file (open-input-file "input.txt"))
+(define out-file (open-output-file "output.txt"))
+
+; Read and write characters from the input file
+; to the output file one by one until end of file
+(do ((c (read-char in-file) (read-char in-file)))
+        ((eof-object? c))
+        (write-char c out-file))
+
+; Close the ports
+(close-input-port in-file)
+(close-output-port out-file)