Problems with decimal point in java

Question

I have this simple code again

import java.util.Scanner;

public class Program
{
public static void main(String[] args) {

Scanner input = new Scanner(System.in);
double num = input.nextDouble();

System.out.println(num);
}
}
when my input is 3.7, in eclipse gives me error (in SL don't) Why this happens?
I solved the problem with:

double num = Double.parseDouble(input.nextLine));

Now I can enter a number with decimal point, why? I don't quite understand.

Answer 1

try entering 3,7. instead of 3.7

Answer 2

This is the error:
Exception in thread "main" java.util.InputMismatchException

at java.util.Scanner.throwFor(unknown Source)
at java.util.Scanner.next(Unknown source)
at java.util.Scanner.nextDouble(Unknown source)
at Test.main(Test.java:8)

Answer 3

Thats true! I don't have any error If I enter 3,7 instead 3.8... thx!

Answer 4

//try float for variable;
float num= sc.nextFloat();

import java.util.Scanner;
//Rbcode org
class Compoundint{
public static void main(String[] args) {

System.out.println("welcome calculate your compound intrest here...");
double p,t,i;
double ci;
float r;
double temp;
Scanner sc =new Scanner(System.in);
System.out.println("enter princle amount");
p=sc.nextInt();
System.out.println("please enter rate in decimal");
r = sc.nextFloat();
System.out.println("enter time period");
t=sc.nextInt();
System.out.println("principle amount :"+p+"rate :"+r+"time period :"+t);
sc.close();

for (i=1;i<=t ;i++ ) {
ci=p*r*i;
temp=p+ci;
System.out.println("ci : "+temp);
p=temp;
}
}
}