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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double change = 0;
                double diameter = 3;
.               double circ = 3 * Math.PI;
.               for(int i = 0; i< 100;i++){
.               change = circ/36 *.01;
.               diameter += change;
.               circ = (diameter * Math.PI);
}
System.out.print(diameter);
	}
}

Main.java:14: error: illegal start of expression
.               double circ = 3 * Math.PI;
^
Main.java:15: error: illegal start of expression
.               for(int i = 0; i< 100;i++){
^
Main.java:16: error: illegal start of expression
.               change = circ/36 *.01;
^
Main.java:17: error: illegal start of expression
.               diameter += change;
^
Main.java:18: error: illegal start of expression
.               circ = (diameter * Math.PI);
^
5 errors

Standard output is empty