Python Using a stack, implement a function is_valid_expr(expr: str), the function takes in a string representing a mathematical expression, which may include parenthesis, the function returns true if expr is valid, otherwise, it returns false. A valid expression is one that has a matching closing parenthesis for every opening one. Here are some examples: 1 + 10 -> valid (1 + 2) -> valid (2* 3) + (4 * 2 + (x - 1)) -> valid (1 + 1) + (2 * x)) -> invalid ((1 + 5) * x -> invalid
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Python
Using a stack, implement a function is_valid_expr(expr: str), the function takes in a string representing a mathematical expression, which may include parenthesis, the function returns true if expr is valid, otherwise, it returns false. A valid expression is one that has a matching closing parenthesis for every opening one. Here are some examples:
1 + 10 -> valid
(1 + 2) -> valid
(2* 3) + (4 * 2 + (x - 1)) -> valid
(1 + 1) + (2 * x)) -> invalid
((1 + 5) * x -> invalid
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- Stacks 1- Write a Python function that takes a user input of a word and returns True if it is a Palindrome and returns False otherwise (Your function should use a Stack data structure). A palindrome is a word that can be read the same backward as forward. Some examples of palindromic words are noon, civic, radar, level, rotor, kayak, reviver, racecar, redder, madam, and refer. 2- Write a Python function that takes a stack of integer numbers and returns the maximum value of the numbers in the stack. The stack should have the same numbers before and after calling the function. 3- Write a main function that tests the functions you wrote in 1 and 2 above and make sure that your code is well documented.A set of instructions may be used to show a function's return address. Remember that any modifications you make to the stack cannot prevent the procedure from returning to its caller.Code with comments and output screenshot is must for an Upvote Create a Java function that uses a stack and no arithmetic to compare the number of 0's and 1's in a string. If # of 0's is greater, return -1. If # of 1's is greater, return 1. If equal, return 0.
- The return address of a function can be displayed via a series of commands. Keep in mind that any changes you make to the stack must not impede the return of the procedure to its callerin c++ In a stack with 15 elements assume that the data elements are integer values. Write afunction that pops the elements one by one, add 5 to each integer and push the elementback to the stackthe Program in C++, Write a program that evaluates a valid postfix expression such as: 6 2 + 5 * 8 4 / -The program should read a postfix expression consisting of digits and operators into a string. Using modified versions of the stack functions implemented earlier in this chapter, the program should scan the expression and evaluate it. The algorithm is as follows: 1-While you have not reached the end of the string, read the expression from left to right. If the current character is a digit, Push its integer value onto the stack (the integer value of a digit character is its value in the computer’s character set minus the value of '0' in the computer’s character set). Otherwise, if the current character is an operator, Pop the two top elements of the stack into variables x and y. Calculate y operator x. Push the result of the calculation onto the stack. 2-When you reach the end of the string, pop the top value of the stack. This is the result of the postfix expression. [Note: In Step…
- Javascript: Write out the call stack for this program if x is 3. function factorial(x) { if (x === 0) {return 1;}return x * factorial(x-1); }console.log(factorial(x)); Use "not in function" if not in a function, and put the function name along with the arguments if in a function.// the language is c++, please code with common for better understanding, and after your code finished take a screenshot of the execution. Write a C++ program to simulate a stack using an array. You should create an index (the stack pointer) to point into the stack. Initialize it to 0. The stack should grow to location [1], [2], [3], etc. Write a "push (int)" function to push an int onto the top of the stack. Also, write an "int pop" instruction to pop the data that is stored on the top of the stack. The pop instruction must return the popped data. The push and pop instructions should increment and decrement the stack pointer appropriately. Your source should contain calls to your functions demonstrating that it works. Note, that you should do several pushes and several pops to show that data is correctly stored on the stack. You can do this by showing sample runs. Cut and paste the results of the runs into a separate documentModular Programming: Your program should be modular and consists of the following functions: a) read(): - Ask the user for a valid atomic number (Z) b) compute_binding_energy(Z, table): - Build the table (a list of lists) of binding energy where the columns are: the mass number (A), the binding energy (Eb) and the binding energy per nucleon (BEN), while the rows range from A = Z to A = 4Z c) most_stable(table) : - Find and return the row that contains the highest binding energy per nucleon, which corresponds to the most stable configuration. d) print_table(table): - Print the table in a neat tabular format as shown in the sample run in figure 2. e) write_to_file(table, file_name): - Save the table in a text file output.txt as shown in figure 3. 4 f) main(): - The main function is set up to make the calls to the functions as specified in points a) to e)
- pointers as Arguments:In the C programming language there is no pass-by-reference syntax to passa variable by reference to a function. Instead a variable is passed by pointer(just to be confusing, sometimes passing by pointer is referred to as pass byreference). This Practice Program asks you to do the same thing as C.Here is the header for a function that takes as input a pointer to an integer:1. void addOne (int ∗ptrNum )Complete the function so it adds one to the integer referenced by ptrNum.Write a main function where an integer variable is defined, give it an initialvalue, call addOne, and output the variable. It should be incremented by 1.JAVA LANGUAGE CODE Postfix Calculator by CodeChum Admin One good implementation of computing infix expressions is to transform them to postfix and then evaluate via the postfix expression. Infix expressions is the common way of writing arithmetic expressions. The binary operator come between them as shown below: 2 * 5 + 9 - 10 / 20 In postfix expressions, the operands come first before the operator: 2 5 * 9 + 10 20 / - A stack can be used to evaluate postfix expressions. The operands are pushed onto the Stack and when an operator is found two operands are popped and the operation is performed and finally the result is pushed back onto the Stack. The final answer will be the lone element of the Stack. Input The first line contains a positive integer n representing the number of postfix expressions. What follows are n postfix expressions themselves. 5 10 20 + 30 15 2 * + 100 20 30 + / 90 20 10 + + 0 / 9 3 - 10 + 2 * Output A single line containing the result of…In C++ please. Write a program that creates and displays a stack of 4 elements using functions.