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java.util.IllegalFormatConversionException: f != java.lang.String	at java.util.Formatter$FormatSpecifier.failConversion(Unknown Source)	at java.util.Formatter$FormatSpecifier.printFloat(Unknown Source)	at java.util.Formatter$FormatSpecifier.print(Unknown Source)	at java.util.Formatter.format(Unknown Source)	at java.io.PrintStream.format(Unknown Source)	at java.io.PrintStream.printf(Unknown Source)	at Student.main(Student.java:246)