![]() ![]() I will now share my screen with you so that you can see how I write the program. In an ideal program, the program should ask the user for two numbers, and then the program should do whatever mathematical operations it is supposed to do. That is, every time we change the numerical values of the variables, we need to compile the code to generate the class file because of the change. One item is that in our code, we are hard-coding the numbers so far. That should be good enough for a quite primitive calculator. I will write the code of the last lesson and also do the exercise, which is the inclusion of multiplication and division. I will extend the concept that I described in the previous class. In the exercise, which I provided on, I asked for multiplication and division as well. We will build a Calculator program today using Java.įrom the last video lecture, you know how to add two numbers and how to subtract one number from another. I am here today to help you practice more on variables. To stay in touch, please subscribe to our YouTube channel: You will see more of user input in our future videos. The program asks the user for three double numbers and displays (a) the result of the summation of the three numbers the user-provided and (b) the result of the multiplication of the three numbers. Write a program that does the following items. Save the program in a file named MyProg.java. The program that we came up with, for double numbers, in the video is provided below. The programmer can use nextInt() instead of the nextDouble() method to get an integer from the user. In the video, we only covered how to get user input of double data type using a Java Scanner object. Getting User Input from a Calculator Program Written in Java The Final Program Used in the Video With some practice, writing Java code to get input from user becomes quite mundane over time. Getting input from the user is an essential part of programming. The Video: Getting Input from the User, for a Calculator Program, Using Java Therefore, getting input from the user is quite common in computer programs. That is, the program reads the address you provide. You write a destination address, and the software provides you directions to the destination. MS Word helps us format what we want to print.Ĭonsider the Google Maps App on your smartphone. We type on the keyboard, and MS Word saves what we type. ![]() ![]() It requires your input to apply mathematical operations. Consider the calculator program you have on your phone or laptop. Why a Programmer Needs to Know About User InputĪ programmer needs to know about user input due to the tremendous need for user input in many modern day software pieces. 6.10 Getting user input in Java: The nextDouble() method.6.8 Getting user input in Java may not look straightforward.6.7 Hard-coding is not a good idea, in this case.6 Transcription of the Audio of the Video.2 The Video: Getting Input from the User, for a Calculator Program, Using Java.1 Why a Programmer Needs to Know About User Input. ![]()
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