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      "title": "Java Programming For Beginners: Step By Step Lesson #4 || CREATING A SIMPLE CALCULATOR PROGRAM USING ECLIPSE IDE (By @kaffy22)",
      "body": "#### What Will I Learn?\n\n* You will learn how to create a simple arithmetic calculator Java program.\n* You will learn how to use Scanner to input data from keyboard while running a program.\n\n#### Requirements\n\n* Computer system\n* JDK must be installed\n* Eclipse IDE\n\n#### Difficulty\n* The difficulty is just like our previous lessons. So its **Basic**\n\n\n## Tutorial Contents\n\nWelcome back, budding programmers. We had a great class in our previous lesson. And I believe you're finally agreeing with me that **programming is easy** and that that it's not gonna be hard for you to become a great programmer.\n\nToday's class is much like our previous one. We are going to create a simple calculator that can add two integer numbers supplied by the user. This time, we are not going to assign values to our variables. The user will input his preferred values while running the program. Now let's get to it guys!\n\n<center>![Add2 1.jpg](https://steemitimages.com/DQmWwEwQaUMKAN6TH8aJw4aFNChyo928ZN3ecWR5kHQaE9Y/Add2%201.jpg)\nOur program code on Eclipse IDE</center>\n\nLet's take a look at the code vividly.\n\n#### The Code\n\n~~~\npackage BasicTutorials;\nimport java.util.Scanner;\n\npublic class AddTwoIntegersByUser {\n\t\n\tpublic static void main (String[] args){\n\t\t\n\t\tint num1, num2, sum;\n\t\n\t\tScanner input = new Scanner (System.in);\n\t\t\n\t\tSystem.out.println(\"Please, enter the first integer\");\n\t\tnum1 = input.nextInt();\n\t\t\n\t\tSystem.out.println(\"Enter the second integer\");\n\t\tnum2 = input.nextInt();\n\t\t\n\t\tsum = num1 + num2;\n\t\t\n\t\tSystem.out.println(\"The sum of \" + num1 + \" and \" + num2 + \" is: \" + sum);\n\t\t\n\t\t\n\t}\n\n}\n\n~~~\n\n\nYou see how simple that lines of code look? Like I said, this program looks much like the program from our previous lesson. It's time I explain each line of code and how it works.\n\n> package BasicTutorials;\n\nThis is just a package name. Its where our basic tutorials are saved. I already explained this before.\n\n> import java.util.Scanner;\n\nThis import statement which introduces the Scanner class from the util package to the program. This Scanner class is what we'll be using to input data from keyboard and in printing our output to the output window.\n\n> public class AddTwoIntegersByUser {\n\nThis is the program class. The **AddTwoIntegersByUser** is the program class and that represents the name of the program as stored when creating the class.\n\n> public static void main(String[] args) {\n\nThis is the program main method.\n\n> int num1, num2, sum;\n\nThis line introduces our variables to the program. We've just declared our variables **num1**, **int num2** and **sum** with datatype **int** (integer) as needed in the program. I've explained different methods of declaring variables in Java programming in the previous lesson.\n\n> Scanner input = new Scanner (System.in);\n\nDeclaring reference variable of type **Scanner**. This helps helps us in inputting data from keyboard while running the program.\n\n> System.out.println(\"Please, enter the first integer\");\n\nA print statement asking the user to input the first integer through the keyboard.\n\n> num1 = input.nextInt();\n\nThis line stores whatever the user input from the keyboard as the first variable, **num1**\n\n> System.out.println(\"Enter the second integer\");\n\nA print statement asking the user to input the second integer through the keyboard.\n\n> num2 = input.nextInt();\n\nThis line stores whatever the user input from the keyboard as the second variable, **num2**\n\n> sum = num1 + num2;\n\nArithmetic operation takes place here and the result is stored as **sum**\n\n> System.out.println(\"The sum of \" + num1 + \" and \" + num2 + \" is: \" + sum);\n\nA print statement that prepares our result on the output window.\n\nThat's it. We've just created a simple calculator that adds two integers as supplied by the user. Running this program, we must have these outputs below.\n\n<center>![add2 2.jpg](https://steemitimages.com/DQmauBEed6tVqX7JhrKz1AcbA5VPAnMxirqnPsLYafFBMiH/add2%202.jpg)\nAsking the user to supply the first integer</center>\n\n<center>![Add2 3.jpg](https://steemitimages.com/DQmYUQgwTZ9pnjtCh6Bv3wDykpZWj3whHeKGt1pRkv5DLEo/Add2%203.jpg)\nAsking the user to supply the second integer</center>\n\n<center>![Add2 4.jpg](https://steemitimages.com/DQmXLvGTRTizSTeDoSHnpJ35CGgiEzUNB7BXJwiamBfaKzT/Add2%204.jpg)\nThe result is then shown on the output console</center>\n\nThis is where we are going to stop for now, we'll continue in the next class. FOLLOW THIS BLOG FOR SUBSEQUENT LESSONS.\n\nLike I do tell you guys, programming is not hard, programming is not easy, your approach determines which of its side programming shows to you - easy or hard\n\n**Be sure to leave a comment and Upvote. A resteem is also appreciated.**\n\n![](https://steemitimages.com/DQmTDs2tgwLpiiGAiJgRUZHvRYiVde1PYnNeg5ABtiA3S12/image.png)\n\n---\n\n#### Curriculum\n\n- [Java Programming For Beginners: Step By Step Lesson #3 || CREATING A SIMPLE ARITHMETIC PROGRAM USING ECLIPSE IDE](https://steemit.com/programming/@kaffy22/java-programming-for-beginners-step-by-step-lesson-3-or-or-creating-a-simple-arithmetic-program-using-eclipse-ide-by-kaffy22)\n- [Java Programming For Beginners: Step By Step Lesson #2 || Creating Our First Project And Package](https://utopian.io/utopian-io/@kaffy22/java-programming-for-beginners-step-by-step-lesson-2-or-or-creating-our-first-project-and-package-by-kaffy22-the-code-girl)\n- [Java Programming For Beginners: Step By Step Lesson #1 || Setting Up Your JDK & Eclipse IDE](https://utopian.io/utopian-io/@kaffy22/java-programming-for-beginners-step-by-step-lesson-1-or-or-setting-up-your-jdk-and-eclipse-ide-by-kaffy22-the-code-girl)",
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      "permlink": "java-programming-for-beginners-step-by-step-lesson-3-or-or-creating-a-simple-arithmetic-program-using-eclipse-ide-by-kaffy22",
      "title": "Java Programming For Beginners: Step By Step Lesson #3 || CREATING A SIMPLE ARITHMETIC PROGRAM USING ECLIPSE IDE (By @kaffy22)",
      "body": "Welcome back, budding programmer. As you know, this tutorial focuses on cultivating your passion towards programming and changing your the famous perspectives **\"programming is hard\"** to **\"programming is easy\"**. Hence, this class is mainly for people who had no knowledge of Java programming before and hence, the difficulty is **Basic**. Tutorial details below.\n\n#### What Will I Learn?\n\n- You will learn how to create a simple arithmetic Java program\n\n\n#### Requirements\n\n- Computer system\n- JDK must be installed\n- Eclipse IDE\n\n\n#### Difficulty\n- Basic\n\n# Tutorial Contents\n\nIn our previous class, we learned how to write our first code, creating our very first program, **\"Hello world\"** application. For a full recap of the previous lesson, [click here](https://steemit.com/utopian-io/@kaffy22/java-programming-for-beginners-step-by-step-lesson-2-or-or-creating-our-first-project-and-package-by-kaffy22-the-code-girl).\n\nToday we are going to write two java programs. But do not panic, they are going to be as easy as our previous one. Let's get to it guys.\n\n### A simple Java program that adds two integer numbers\n\nHere's our program for today's lesson. This program simply adds two numbers (of integers datatypes. I already explained what **datatypes** are in our previous lessons). Let's take a look at the code below.\n\n<center>![Add1 1.jpg](https://steemitimages.com/DQmRmyyadfsCkPhZemQsgzMniFbzVdikrWrGnHE4AKEFGa8/Add1%201.jpg)\nOur program #1 code on Eclipse IDE</center>\n\nSee the code clearly below.\n\n~~~\npackage BasicTutorials;\nimport java.util.Scanner;\n\npublic class AddTwoIntegers {\n\n\tpublic static void main(String[] args) {\n\t\t\n\t\tint num1 = 5;\n\t\tint num2 = 7;\n\t\tint sum = num1 + num2;\n\t\t\n\t\tSystem.out.println(\"Answer is: \" + sum);\n\t\t\n\t}\n\n}\n~~~\n\n\nSee how simple it looks . Now let me explain each line of the code.\n\n> Package BasicTutorials\n\nThis is just a package name. Its where our basic tutorials are saved. I already explained this before.\n\n> import java.util.Scanner;\n\nWe use the **import** statement which introduces the **Scanner** class from the **util** package to the program. This **Scanner** class is used in printing our output to the output window.\n\n> public class AddTwoIntegers {\n\nThis is the program class. The **AddTwoIntegers** is the class and that represents the name of the program as stored when creating the class.\n\n> public static void main(String[] args) {\n\nThis is the program main method.\n\n> int num1 = 5;\n\nDeclaring the integer one (first number/variable) and assigning the value **5** to it.\n\n> int num2 = 7;\n\nDeclaring the integer two (second number/variable) and assigning the value **7** to it.\n\n> int sum = num1 + num2;\n\nThis is the variable that holds the outcome of the arithmetic operation taking place here.\n\n> System.out.println(\"Answer is: \" + sum);\n\nThis is the print statement. This statement helps us print the result of this program on the output window.\n\nThat's it! You see how simple it is. Like I do tell you, programming is easy. You just have to be focused and give much commitment to it. In no time, you're gonn' become a great programmer.\n\nLet me tell you this, there's another method we can use to declare our variables in this program. We can choose to first declare all the variables we want need in this program and then  assign values to the in another lines.\n\n~~~\nint num1;\nint num2;\nint sum;\n~~~\n\nIn the code given above, we only declared the variables we need in the program. No value is giving to them. we can then add this next lines of code below to assign values to them.\n\n~~~\nnum1 = 5;\nnum2 = 7;\nsum = num1 + num2;\n~~~\n\nAdding these together, we would have had this code below\n\n###### Method 2\n\n~~~\nint num1;\nint num2;\nint sum;\n\nnum1 = 5;\nnum2 = 7;\nsum = num1 + num2;\n~~~\n\nNote that if we choose to use this method (declaring our variable first and then assigning values to them thereafter), we do not add the datatype **int** when assigning the values. This is so because we've already add the datatype for the variables when declaring the in the first lines.\n\n**Alternatively, we can choose to use this method below:**\n\n###### Method 3\n\n~~~\nint num1, num2, sum;\nnum1 = 5;\nnum2 = 7;\nsum = num1 + num2;\n~~~\n\nThis new method saves us some time and lines. Since these variables are having the same datatype **int**, we can choose this method.\n\nNow take a look at the output of this program below.\n\n<center>![Add1 2.jpg](https://steemitimages.com/DQmaNxc6zCnB3LBTDjuYMqLDi2UYmeYVN2dW3635p22ze7M/Add1%202.jpg)\nOur program output</center>\n\nThe result **\"12\"** is displayed at the output window.\n\nThat's all for today guys. Check on the curriculum below to get a better understanding of this lesson. Do drop your feedback. Thanks for reading.\n\nDON'T FORGET TO UPVOTE THIS.\n\n---\n\n#### Curriculum\n- [Java Programming For Beginners: Step By Step Lesson #1 || Setting Up Your JDK & Eclipse IDE](https://utopian.io/utopian-io/@kaffy22/java-programming-for-beginners-step-by-step-lesson-1-or-or-setting-up-your-jdk-and-eclipse-ide-by-kaffy22-the-code-girl)\n- [Java Programming For Beginners: Step By Step Lesson #2 || Creating Our First Project And Package](https://utopian.io/utopian-io/@kaffy22/java-programming-for-beginners-step-by-step-lesson-2-or-or-creating-our-first-project-and-package-by-kaffy22-the-code-girl)",
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