calculator with parentheses

This article mainly introduces a calculator code implemented by python3.5 + PyQt5 + Eric6. the calculator can be run perfectly in the windows732-bit system. if you are interested, please take a look. This article mainly introduces a calculator method (with code) implemented by python3.5 + PyQt5 + Eric6. the calculator

calculation of the symbolExp_sum = ADD_SUB (exp)#Call Add_sub to calculate addition and subtraction returnExp_sum#float #返回计算结果defMain (exp): Exp= Exp.replace (' ',"')#Delete spaces in a string whileTrue:ret= Re.search ('\([^()]+\)', exp)#Match parentheses ifRet:#if it matches.Inner_bracket = Ret.group ()#use Group () to extract the bracketed content that matches tores = str (cal (Inner_bracket))#call Cal () to calculate the contents of

Click on the image to view↓↓↓↓↓↓↓↓The 1th chapter: means algorithmCircumference "One minute Calculator" The 1th Chapter: refers to the algorithm first section opponent's understanding circumference item "One minute Calculator" 1th chapter: refers to the algorithm second section the single digit is bigger than 10 digits 1 times 9 The Operation circumference item "One minute

Parentheses Column Values Between the columns using four parentheses ' (', ') ', ' [', ' '] ', a correct parentheses column is defined as below:1. ' () ' or ' [] ' consisting of a couple of parenthesis is correct.2. If X is the correct parentheses column, both ' (x) ' and ' [x] ' is correct.3. If both X Y

parenthesis) return parentheses (string) #最后继续匹配括号, knowing that all brackets are taken out and the results taken out.3. Wait until the function is complete to debug the calling function and the expression that evaluates the formulaStat_print = Print ("calculator version 3.0 \ n Input ' q ' exit program") while True: formu

' | bc128$ echo "obase=10;ibase=16;80" | bc1284. Exponential operation:$ echo "5^5" | bc3125$ echo "(5^5) ^5" | bc298023223876953125Remember that the result of the first exponential operation is to add parentheses.5. Function library-based operationsBC supports the following functions:s (x): sine function (x is radians)C (x): cosine function (x is radians)A (x): Inverse tangent function (the result is radians)l (x): Natural logarithm functionE (x): e

One, parenthesis, round brackets () 1, single parenthesis () ① command group. The commands in parentheses will be executed in a new sub-shell sequence, so the variables in parentheses cannot be used by the rest of the script. Multiple commands in parentheses are separated by semicolons, and the last command can have no semicolon, and there is no space between the

One, parenthesis, parentheses ()1, single parenthesis ()?? ① Command Group. The commands in parentheses will run in a new sub-shell sequence. So the variables in parentheses cannot be used by the rest of the script. Multiple commands in parentheses are separated by semicolons, and the last command can have no semicolon

One, parenthesis, parentheses ()1, single parenthesis ()① Command Group. The commands in parentheses will be executed in a new sub-shell sequence, so the variables in parentheses cannot be used by the rest of the script. Multiple commands in parentheses are separated by semicolons, and the last command can have no semi

Calculator ideas 1. Input formula required2. Whether the test formula contains letters3, if the inclusion of letters will need to re-enter, otherwise the next operation4, detection of the existence of parentheses, if there is parentheses, the value of the parentheses inside the priority operation, and then assign

public class Counter {/** uses recursive algorithms to calculate the formula in parentheses and then recursively* @param args*/public static void calculator (String str) {System.out.println (str);Load to StringBuffer boost efficiencyStringBuffer cstr= new StringBuffer (str);To group the remaining symbols and numbers in a formula with a regularPattern P=pattern.compile ("\\-?[ 0-9]+ (\\.[ 0-9]+)? | [*/]");if

Share a command-line calculator - BCIf you need a calculator in a graphical desktop environment, you may only need to click on it all the way to find a calculator. For example, a tool called Calculator is already included in theFedora workstation . It has several different modes of operation, for example, you can perfo

A small calculator using bat/batch processingThis is a small calculator that I made with bat/batch processing. Copy the following code to notepad and save it as. bat format. The formula is supported. For example, the input value is 12 + 12/(7-5), but only integer calculation is supported, and decimal calculation is not supported. It is not very useful, and the technical content is not very high, but the pro

(i)elifFIND_[INDEX-1] = ="-": #If two negative numbers are subtracted, they are added or subtracted ifTag = =True:res+=float (i)Else: Res-=float (i)Else: #case where I is empty when processing without parentheses ifI! ="": Res=float (i)returnResif __name__=='__main__': whileTrue:calc_input= Input ("Please enter a calculation formula \ n default to:%s:"%a). Strip ()Try: ifLen (calc_input) = =0:calc_input=a calc_i

Homework:Use regular expressions and recursion to implement the calculator function.Realize:1, the implementation of the calculation of parentheses2, achieve the index, subtraction and other functionsFirst, the example illustrates:This instance wrote a version of itself, but there is still a little bug, example:-2-2 and other computational problems, so finally in the code based on Wu Sir added index, to seek redundancy and other functions.The

What I want to say here is the parentheses in several shells, the braces and the bracketed variables, and the use of the command, as follows: 1.${var}2.$ (CMD)3. () and {}4.${var:-string},${var:+string},${var:=string},${var:?string}5.$ ((exp))6.$ (Var%pattern), $ (Var%%pattern), $ (Var#pattern), $ (var# #pattern) It is now divided as follows: prototype of the variable in 1.Shell: ${var}common variable forms are $var, such as $ var=test$ echo $varT

Topic:Implement a basic calculator to evaluate a simple expression string.The expression string may contain open ( and closing parentheses ) , the plus + or minus sign - , Non-negati ve integers and empty spaces .Assume that the given expression was always valid.Some Examples:"1 + 1" = 2 "2-1 + 2" = 3 "(1+ (4+5+2)-3) + (6+8)" = 23Note:do not use the eval built-in library function.Test instructions: Design

Transferred from: http://blog.sina.com.cn/s/blog_85295a390100xzxn.htmlIn fact, summed up as follows:The function must be bracketed if it is to invoke it for execution. At this point, the function () is actually equal to the function's return value. Of course, some have no return value, but have performed the behavior in the body of the function, this is the fundamental, that is, as long as the parentheses, will execute the function body code.Without

In fact, summed up as follows:The function must be bracketed if it is to invoke it for execution. At this point, the function () is actually equal to the function's return value. Of course, some have no return value, but have performed the behavior in the body of the function, this is the fundamental, that is, as long as the parentheses, will execute the function body code.Without parentheses, the function

Functions (), (), [], [], and {} of various parentheses in shellI. Parentheses ()1. Single parentheses () ①Command Group. The commands in parentheses will open a new sub-shell for sequential execution, so the variables in parentheses cannot be used by the rest of the script.