Lecture 5 - Primitive Data Type Example
Primitive types problem statement
Implement a ‘double’ data type, ‘doubleNumber’, initialized as 9781.3
Primitive types example solution
double doubleNumber = 9781.3;
Primitive types example output
9781.3
Problem statement
Hi there, I am Marius from AlefTav Coding. In this lecture I will look at an example of Java's primitive data types. You will learn how to 'Implement a double data type, named, ‘doubleNumber’, initialized as 9781.3'
public class Lecture5 {
public static void main(String[] args) {
// TODO: Implement a ‘double’ data type, ‘doubleNumber’, initialized as 9781.3
System.out.println("doubleNumber");
}
}
How Java stores information
Inside your computer there are many storage locations where different pieces of data are stored. You as a Java developer must first prepare each one of these storage locations before your Java program can use it. Technically, you must first declare a storage location. This declaration pattern in Java is to identify the type of data that can be stored at a location. Then you give that storage location a name. In this example, the data type is double and the storage name is doubleNumber.
Now, after you have told Java what type of data to store at a location, the next step is to put a value at that location. The equals symbol, (=) means to assign a value. You assign the value 9781.3 to the location named, doubleNumber. The technical term for this step is initialization. I have combined the declaration step and initialization step into one as follows: double doubleNumber = 9781.3;.
The reason I am using the Java data type, double is because here I work with a fractional number, 9781.3. The data type, double is one of Java's primitive data types. Java allocates a set storage size for each of the different primitive data types. Because Java knows the sizes at the time of declaration, it will store primitive types at those locations.
My class in this lesson is, Lecture5 with the usual main() method. The solution code must be typed in the line with the TODO comment. After that, I do a printout. So, I instruct Java to print the value stored at the location named doubleNumber.
// TODO: Implement a ‘double’ data type, ‘doubleNumber’, initialized as 9781.3
Next, I remove the TODO comment, and I type in my solution, double doubleNumber = 9781.3;. The complete program is as follows:
public class Lecture5 {
public static void main(String[] args) {
double doubleNumber = 9781.3;
System.out.println("doubleNumber");
}
}
When I run this program the value, 9781.3 will be displayed, indicating that my program works correctly.
Coding Exercise
In this lecture you learnt how to implement the primitive data type, double. Below is a coding exercise for you to complete as homework:
public class Lecture6 {
public static void main(String[] args) {
// TODO: Implement an ‘int’ data type, intValue, initialized as 4326
System.out.println(intValue);
}
}
My name is Marius from AlefTav Coding. Thanks for reading and KEEP on STEAMING.
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I thank you for your contribution. Here are my thoughts;
Contributions on Utopian must be open source and contain correct repository from GitHub. This one does not contain a repository. As there is no official repository for Java, you can include whitelisted unofficial repository for it. You can find whitelisted repositories on the guidelines page.
Main purpose of the tutorial is to teach the user something unique, not to show ubiquitous functions and replicate well-documented concepts. What you've shown here can easily be found on the internet, with great quality. So, what I suggest is changing the topic or increasing both the quality and the volume of the tutorial to provide a better alternative to those ones over the internet.
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Thank you for your review, @yokunjon!
So far this week you've reviewed 2 contributions. Keep up the good work!
Hi @mariusclaassen,
Sadly, your tutorial doesn't follow the tutorials template. And the presentation needs improvement, I suggest spending some of your time reading the top contributions for Tutorials category which is a weekly publication of Utopian, as for period 2nd to 8th of August, click here. And your tutorial is a bit basic and is well-documented in the web, like this one. Try looking for open source projects and do tutorials that are unique and that gives value to open source. Lastly, you may try following @drsensor, both here in Steemit and Github, to see how he does his tutorials and you can use his methods for your reference.
I thank you for your feedback. But, I have to correct something to avoid confusions. Contributions might not follow the templates if they are well organized. That is only a guideline which shows a good way to structure the posts, but it isn't the only way.
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