Error when compiling cannot resolve symbol

Question

I am kind of new to java please take a look into this code. I am getting this error cannot resolve the symbol.
this is the first class I saved under folder called javapractice as t1. I don't get any error message when I compile this, but when I compile the second class I got the error message.It would be appreciated if someone can help. thanks
package javapractice;
public class t1{
double a;
double b;
double c;
t1(double ax){
a = ax;
b = 0;
c = 0;
this is the second class also I saved as t2 under javapractice folder. when I compile this class I got the error cannot resolve the name.
package javapractice;
public class t2 {
public static void main(String args[]) {
t1 d = new t1();
d.a = 3;
System.out.println(d.a);
System.out.println(d.b);
System.out.println(d.c);

Answer 1

The problem ist1 d = new t1();You need to pass a double param. to the constructor of t1t1 d = new t1((double)10.0);