Question

I am not experienced in Java at all and am using a text editor to write code so I can’t see what the problem is (I am running from command line)
I see the error and know what it is but I have no idea how to fix it

System.out.print(String.format("%7d", Math.pow(n,2).toString()));

I also tried without the .toString()
Basically if I print only n it works, but the power function gives me an error probably because of return types, but pow should return a double and the string format %7d is probably also double right?

Answer 1

You are using wrong format specifier.. %d is used for integer.

Math.pow() returns primitive double on which you cannot invoke toString() method.

Try using %7s which is for String, and convert your primitive double value to Wrapper type: –

String.format("%7s", Double.valueOf(Math.pow(n,2)).toString())

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But, you don’t need to convert your argument to String, you can directly use double value with %f: –

String.format("%.3f", Math.pow(n,2));