Notice how we used print instead of println. Let’s print out a new message: (“Please enter the first number: ”) After that, we need to prompt the user for the first number. We first declared a variable named welcomeMessage of type String with content “Welcome to my Java calculator!” and then printed it to the console. I’m only demonstrating how to declare a String.Īgain, DO NOT copy and paste as the quotation characters can cause issues! Let’s display “Welcome to my Java calculator!”: String welcomeMessage = “Welcome to my Java calculator!” (welcomeMessage) We want to do the same with our calculator - to display a friendly message at startup. When we start up Windows XP, we see a big “Welcome” at the login screen. we meet someone, we usually say our greetings first. Menu-based Calculator Program in Java using Methods import ĭouble divide=0.0, remainder=0.0, power=0.0 So, we should develop a calculator program in java as Menu driven program. It is possible that the end-user doesn’t know which operator will do what operation. For this purpose we should use a loop.ģ) We are directly displaying the available operator. The program should ask for input until the end-user wants to continue. Due to this, after addition, if we want to subtract then again we need to run the program. So, for every operations (like addition, subtraction, multiplication, division, finding remainder, and calculating power) there will be seprate methods.Ģ) After performing one operation (like addition) Java completes, it doesn’t ask that “Do you want to next operation?”. These code for different operations should be placed in a different method. In the above java program we directly done every operations like addition, subtraction e.t.c using operators, but we shouldn’t do that. Now, we will do add some extra codes to this program.ġ) We should perform every operations through methods. We have successfully developed a simple basic calculator in Java using switch case statements. The output for the different test-cases:. Simple calculator program in Java using switch case import It is always recommended to initialize all the local variables with their default values. It is good programming practice to place all variables declaration at the top of the methods so programmers can easily understand. The double data type can hold both integer and floating-point numbers. If you choose the data type of input variables as integer type (int/long) then the calculator doesn’t work on floating-point numbers so we should choose the variables as a double data type. Two keywords are used in the program:- switch and case. The switch case statement in Java programming is a multi-way decision that tests whether an expression matches one of a number of constant integer values, and branches accordingly.
It can add, subtract, multiply, divide, find the remainder and also find the power of the number.įirst we will develop simple calculator program in java using switch case statements.
It will be a basic calculator in java with CUI (character user interface). In this post, we will create a simple calculator program in the Java programming language. Simple Calculator Program in Java | Previously we had developed many basic Java programs on flow control statements.
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