Java Troubleshooting Error: Cannot Find Symbol in Java Code

[whatisreality]

My program says it doesn't recognise the symbol signum(double) or sqrt(double)! I have definitely done the whole import java.lang.Math; thing. And signum and sqrt aren't symbols anyway. Is that too vague? I can post the actual code.

It's only my second week learning java, so it's supposed to be pretty straightforward stuff.

 

[Borg]

My program says it doesn't recognise the symbol signum(double) or sqrt(double)! I have definitely done the whole import java.lang.Math; thing. And signum and sqrt aren't symbols anyway. Is that too vague? I can post the actual code.

It's only my second week learning java, so it's supposed to be pretty straightforward stuff.

Yes, the source code and imports would help.

 

[Mark44]

My program says it doesn't recognise the symbol signum(double) or sqrt(double)! I have definitely done the whole import java.lang.Math; thing. And signum and sqrt aren't symbols anyway. Is that too vague? I can post the actual code.

I'm guessing that when you compile your code, the compiler isn't able to find the library code. The term "symbol" is computerese for the name of a variable, function, what-have-you, not a symbol such as $\Sigma$ or $\int$. Even if your source code has a line where you import some library, if your installation isn't set up correctly, the compiler won't be able to find the code for functions you're importing.

 

[jedishrfu]

Are you trying to use the actual symbol $\sqrt ()$ in your source code instead of Math.sqrt()?

Java supports unicode but it doesn't support using the $\sqrt()$ symbol or +- signum as valid operators in expressions. It instead requires you to type Math.sqrt() or use + and - for a number's sign.

 

[whatisreality]

Are you trying to use the actual symbol $\sqrt ()$ in your source code instead of Math.sqrt()?

Java supports unicode but it doesn't support using the $\sqrt()$ symbol or +- signum as valid operators in expressions. It instead requires you to type Math.sqrt() or use + and - for a number's sign.

You are a hero! I forgot to put Math.sqrt! I was just using sqrt. And now my code works!

Thanks for all the replies, really appreciate it :)