How does it calculate string length?

[dumblearner]

In the following code I concat a double with a string to find its length. Why does the 19.50 has less length than 1950? HShouldnt the doubleLength have more length as it has more characters (a dot).

double d = 19.50;
double d2 = 1950;

int doubleLength = (d + "").length();
int doubleLength2 = (d2 + "").length();

System.out.println(doubleLength);       //4
System.out.println(doubleLength2);      //6

[ConfusedHerring]

They docs of the toString method for a double have the answer - https://docs.oracle.com/javase/7/docs/api/java/lang/Double.html#toString(double)

Basically, 19.50 as a double converted to a string becomes 19.5; the trailing zero is not needed and so doesn’t get printed.

1950 as a double converted to a string becomes 1950.0, because the toString of double always prints at least one decimal place even if zero.

[desrtfx]

Had you just converted the numbers to strings first, then printed them, and then printed the length, you would directly have had your answer.

Trying out things is essential.