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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 a;
		while (-4e9 < a < 4e9);
		double b;
		while (-4e9 < b < 4e9);
		double c;
		System.out.println(c = a+b);
		}
}

Main.java:13: error: bad operand types for binary operator '<'
		while (-4e9 < a < 4e9);
		                ^
  first type:  boolean
  second type: double
Main.java:15: error: bad operand types for binary operator '<'
		while (-4e9 < b < 4e9);
		                ^
  first type:  boolean
  second type: double
2 errors

Standard output is empty