import java.util.*;
public class Example
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.println("Please enter a Double:");
double numDouble = in.nextDouble();
}
}
You type it in with your keyboard.
Answer: Your keyboard isn't connected to your computer or download the newest version of Java. Answer: If you clicked somewhere else, it may be that the Java applet doesn't "have the focus". You may have to click first, to have the Java applet (RuneScape) react to the keyboard.
A computer, keyboard and Java compiler.
In Java, you can use either a float or a double
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"real" numbers, in any programming language, are actually approximations of what is called a "real number" in math. Basically, a number that can handle decimals - but unlike the actual real numbers, of limited precision. In Java, the "real" data types are float, and double. double has greater precision. A "constant" in Java is similar to a variable, but its value can't be changed after it has been assigned a value.
All of the Java number classes have a parse[type] method, like parseInt() in Integer or parseDouble() in Double that convert Strings to primitive numbers. String s = getInput(); int var = Integer.parseInt(s);
Buy new keyboard.
No. Java uses no unsigned numbers.
There is does a 'long' datatype in java, but no 'long double'.
Part of keyboard with letters and numbers etc
float and double are types of numbers that accept decimals. Consider them as numbers in scientific notation. double allows a larger range of numbers than float, and more significant digits. Usually you would use double, unless you have some special situation, like a large array of numbers, and you decide the extra precision is not necessary.