Ways of making a plus/minus button on a calculator work
Dec 4, 2012 · I'm trying to make a plus/minus button on a calculator work, the idea is basically that what the displayed number should be multiplied by -1, unless if it is equal to 0. I thought I would do it this way; if greater than 0, prepend a "-" sign, if less than 0, delete the first character in the string (which is then "-"), if equal to 0, leave it ...
Plus or minus minor glitch in my android calculator
Nov 24, 2013 · I have made an android calculator, and I have added the +/- button to it recently. The problems I am facing is, firstly when I use it, and press the equal button, the app crashes. Moreover as soon as I click +/- button, the digits turn into a float value, and when I type any number the number value continues after the decimal.
c# - Calculator positive and negative sign - Stack Overflow
Dec 13, 2013 · I'm learning to create a calculator program. But I'm kinda frustated on how to make the numbers positive or negative. Just like we see in a normal calculator. I'm not really sure how can I make a positive number turn to a negative or make the negative sign positive again by using a button to a textbox.
Java/Android - Plus minus button on a calculator - Stack Overflow
Jul 26, 2015 · Unlike other StackOverflow questions, I don't want to display the result of the expression and then add a minus or plus sign. I want to turn the entire expression into negative or positive when pressed. For example:-(5*8+7/7) or when +/-pressed again: 5*8+7/7 Here is …
java - plus () and minus method - Stack Overflow
Sep 14, 2012 · Ok so I am going to try this again. I have a very basic calculator application. I am currently having trouble figuring out how to get my plus() and minus() methods to work. Whenever I run the code, the plus() method is adding currentValue + currentValue. I want it to act like a calculator and add two different integers together. Any suggestions?
How to implement a plus/minus button in a calculator work?
I want to create a button on the calculator that could convert a positive number into a negative one and also could change a negative number into a positive number. Here is the code in js: funct...
javascript - Why calculator works incorrectly? - Stack Overflow
Sep 21, 2017 · I am trying to make my first calculator with vanilla JS. My logic is the following. You click on a number(1/2) you hit on a sign (plus/minus) you click on a second number ; you hit equals and get an answer. My equals button gets different functions through plus and minus. However, it does not work properly.
javascript - Calculate with minus/plus buttons - Stack Overflow
Mar 18, 2022 · First I'm a JS beginner. I need to make a calcul using both input type number and plus/minus buttons linked to it (to replace spinners on smartphone screens). I precise I can't use JQuery or any other external library. I face 3 problems : if I don't first focus the input, the "+" button does not work (the function is not called).
How to create a total using plus minus buttons and input box
Jan 9, 2019 · Im trying to make a price calculator where 1 employee = $21 a month. There are two way I want to be able to set the quantity of employees. I would like to use a plus and minus sign to adjust the quantity as well as have an input box where they can type the quantity. Adjusting either will instantly update the total.
parsing - How to make a calculator with strings and numbers as …
Sep 15, 2013 · As "plus" is supposed to be a token, you need to define it as such in lex: ie you need something like this t_plustext = r'plus' (note that "+" and "plus" will be 2 different tokens). Then, in yacc you must use plustextand not 'plustext' (the 'x'is only valid for single char) –