(Homework Solution): in java please1.3.9 Write a program that takes from standard input an expression

1.3.9 Write a program that takes from standard input an expression without left pa- rentheses and prints the equivalent infix expression with the parentheses inserted. For example, given the input: 1+23- 4 S-6 your program should printin java please1.3.9 Write a program that takes from standard input an expression without left pa- rentheses and prints the equivalent infix expression with the parentheses inserted. For example, given the input: 1+23- 4 S-6 your program should print

Expert Answer


import java.util.Scanner;        //To get input from user using Scanner()
import java.util.Stack;          //To use Stack class

public class infixnotation {

public static void main(String[] args) {

int i=0;                        //Variable to run Loop
char ch;
Scanner input = new Scanner(System.in);        //Using a Scanner to get input
String expression = input.nextLine();         //Getting input from user

Stack<Character> symbols = new Stack<>();     //Creating one stack symbols to store Operators
Stack<String> values = new Stack<>();         //Creating another stack to store Operands

while(i < expression.length())      //Loop to process the elements in user input
ch = expression.charAt(i);   //Assigning element of user input to variable ch
int convert = ch;            //A variable to convert character value to interger value

if(ch==’+’||ch==’*’||ch==’-‘||ch==’/’) //Condition for Operators +,*,-,/

else if((convert>47&&convert<58)||(convert>64&&convert<91)||(convert>96&&convert<123)) //Condition for Operands 0-9, A-Z, a-z
String str = “”;
str += expression.charAt(i);
else if(ch==’)’) //Condition for a parentheses
String x = values.pop(); // Copying Operands after the Operator to String x
String y = values.pop(); // Copying the Operands before the Operator to String y
char z = symbols.pop();   //Copying the Operator to variable z
StringBuilder pool = new StringBuilder();   //Using pool variable to recontruct the stack
pool.append(“(“);   //Ading left parenthese to the pool
pool.append(y);     //Adding Operands before the Operator
pool.append(z);     //Adding the operator
pool.append(x);     //Adding Operands after the Operator
pool.append(“)”);   //Adding right parenthese to the pool
values.push(pool.toString()); //Pushing the Pool to Operands stack


System.out.println(values.pop()); //Printing the Final stack


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