Your next step should be to learn about object orientation.
of the three input elements (two numbers and operation), why do you just repeat the operation in the result output? Some outputs are unnecessary, some info could be added. Run your program and have a critical look at the inputs and outputs.At least separate user interface and algorithmic tasks. Don't do everything in the main() method.(eo + "- \n Your Result: "+ ( firstNumber - secondNumber )) ĭefault: ("\n Please select a valid character") (eo + "+ \n Your Result: "+ ( firstNumber + secondNumber )) (eo + "/ \n Your Result: "+ ( firstNumber / secondNumber )) (eo + "* \n Your Result: "+ ( firstNumber * secondNumber )) Scanner scanner = new Scanner(System.in) So, a formally-improved version might be: import To me, that looks like old-fashioned C language from the 1970s. Don't declare variables some lines before you use them (like you did with xe and xo).A variable name should clearly tell what its content means. Use variable names like "operation" (good example), and avoid names like "xe", "xo", or "eo".Every reader of your program will see that you are closing your resource, even without your comment. You can omit comments like //Close if the next line does exactly this, explicitly.Use spacing consistently (insert a space after an opening parenthesis or not?).
#JAVA CONSOLE CALCULATOR CODE#
#JAVA CONSOLE CALCULATOR INSTALL#
Read and follow the Java code conventions: e.g. It is not possible to install Java on a standard calculator.
Let me suggest some improvements for the next program version. ("\n Select between (*,/,+,-)\n Type out the character in a single letter: ") Ĭase "*": (EO + "* \n Your Result: "+( xe * xo )) break Ĭase "/": (EO + "/ \n Your Result: "+ ( xe / xo )) break Ĭase "+": (EO + "+ \n Your Result: "+ ( xe + xo )) break Ĭase "-": (EO + "- \n Your Result: "+( xe - xo )) break ĭefault: ("\n Please select a valid character") } public class OperatorSwitch Output The two numbers are defined as 40.0 and 12.Just started out on Java and I would like to know your opinions on this calculator I made, took me 30 minutes so you can be rough. Here, the integer has been previously defined, and its value is accessed and displayed on the console. } Output Required packages have been importedĬhoose any of the following operator: +, -, *, /, % ("The operator you have selected is invalid") ("Enter any of the following operator: +, -, *, /, %") Scanner my_scanner = new Scanner(System.in) ("Required packages have been imported") import ĭouble my_input_1, my_input_2, my_result You can try this example live in our coding ground tool. Here, the input is being entered by the user based on a prompt. Step 5 - Pass the operator value to the case statements to calculate the arithmetic operation between the two inputs ‘my_input_1’ and ‘my_input_2’ Step 4 - Define case statements which takes ‘operator’ value as switch case to calculate the sum, difference, multiplication, division, modulus. Step 3 - Read the required values from the user/ define the values Step 2 - Declare three values namely my_input_1, my_input_2 and my_result and declare a character value namely operator. The desired output would be − The result is 40.0 % 12.0 = 4.0 Algorithm Step 1 - START Suppose our input is − The two inputs: 40.0 and 12.0 The switch statement evaluates an expression, matching the expression's value to a case clause, and executes statements associated with that case.įollowing are the arithmetic operations we are going to perform.
#JAVA CONSOLE CALCULATOR HOW TO#
In this article, we will understand how to construct a simple calculator using switch-case.
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