import java.util.Scanner;
public class TestC {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
double a,b,c;
Scanner input = new Scanner(System.in);
System.out.println("please input a and b:");
a =input.nextDouble();
b =input.nextDouble();
c=(a*b)/(a+b);
System.out.println(c);
}
}
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