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Calculatorl.java

//BOYD, TIMMOTHY R
//PROJECT 2

package Project2;
import java.lang.*;
import java.io.*;
import java.util.*;

public class Complex {
        double real;
        double imaginary;
        
        public Complex(){}
        
    
    /** Creates a new instance of Complex */
    public Complex(double real, double imaginary) {
        this.real = real;
        this.imaginary = imaginary;
        
    }
        
                
    //METHODS TO EVALUATE COMPLEX NUMBERS
    
        public Complex add(Complex other){
          double realresult = this.real + other.real;
          double imagresult = this.imaginary + other.imaginary;
          Complex result = new Complex(realresult, imagresult);
          return result;
        }
        
        
        public Complex subtract(Complex other){
          double realresult = this.real - other.real;
          double imagresult = this.imaginary - other.imaginary;
          Complex result = new Complex(realresult, imagresult);
          return result;
        }
         
        public Complex multiply(Complex other){
            
          double realresult = ((this.real) * (other.real));
          double imagresult = ((this.imaginary) * (other.imaginary));
          Complex result = new Complex(realresult, imagresult);
          return result;
        }
          
          
        
        //METHOD TO DISPLAY A COMPLEX NUMBER OBJECT AS A STRING
          public String toString(){
              if(this.imaginary > 0 && this.real < 0)
              return "(" + this.real + "+" + this.imaginary + "i)";
              
              else if(this.imaginary > 0 && this.real > 0)
              return "(" + this.real + "+" + this.imaginary + "i)"; 
              
              else if(this.imaginary < 0 && this.real > 0)
              return "(" + this.real + this.imaginary + "i)";
              
              else 
              return "(" + this.real + this.imaginary + "i)";
          }

//TAKES A STRING IN THE FORM 42-382i AND CREATES AND RETURNS A NEW COMPLEX OBJECT
          
          public static Complex fromString(String expression){
              
             double real, imaginary;
             double number[] = new double[2];
             int i=0;
             Stack stack = new Stack();
             StringTokenizer tokenizer;
             String token="";

tokenizer = new StringTokenizer(expression, " ()+-*i", true);

while (tokenizer.hasMoreTokens()){
                token = tokenizer.nextToken();
                  
                  
                  if (Character.isDigit(token.charAt(0))) {
             //IF THE TOKEN IS A NUMBER
                      number[i] = (Double.parseDouble(token));
                      i++;
                  }//end if
              
             //IF THE TOKEN IS A NEGATIVE NUMBER
                else if (token.equals( "-" )){
                    if (tokenizer.hasMoreTokens())
                        token = tokenizer.nextToken();
                    double negative = ((Double.parseDouble(token)) - ((Double.parseDouble(token)) *2));
               
                    number[i] = negative;
                    i++;
                }//end else
          
                }//end while

real = number[0];
        imaginary = number[1];

//RETURNS A NEW OBJECT OF THE COMPLEX CLASS CONTAINING A REAL AND IMAGINARY DOUBLE
        Complex fromstring = new Complex(real, imaginary);
          
          return fromstring;
            
            
          }
          
}

Project2.java Main( ) //BOYD, TIMMOTHY R //PROJECT 2 package Project2; import java.util.*; import java.io.*; public class Project2 { private static BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); //MAIN METHOD public static void main(String[] args)throws IOException { double result; double real, imaginary; char operands; int i=0; String expression, token, complex=""; StringTokenizer tokenizer; Stack stack = new Stack(); boolean working = true; System.out.println("Enter a postfix expression of complex numbers:"); expression = stdin.readLine(); tokenizer = new StringTokenizer(expression, ")(+-*i", true); token = tokenizer.nextToken(); while (tokenizer.hasMoreTokens()){ /*PUSHES THE WHOLE COMPLEX NUMBER IF THE TOKENIZER IS POSITIONED AT THE BEGINNING OF A COMPLEX NUMBER*/ if(token.equals( "(" )){ while(!token.equals( ")" )){ token = tokenizer.nextToken(); if(!token.equals( ")" )) complex += token; /*THE STRING COMPLEX IS NOW IN THE CORRECT FORM TO BE SENT TO THE FROMSTRING METHOD*/ }//END WHILE /*STRING SHOULD BE IN FORM 32+18i THE STRING COMPLEX IS THEN PASSED TO FROMSTRING, AND A COMPLEX OBJEC IS CREATED AND RETURNED*/ Complex pushed = Complex.fromString(complex); /*THE NEW OBJECT IS THEN PUSHED TO THE STACK*/ stack.push(pushed); complex=""; }//end if /*IF THE TOKENIZER IS AT THE END OF A COMPLEX NUMBER, MOVE ONE MORE TOKEN*/ if(token.equals( ")" )){ if(tokenizer.hasMoreTokens()){ token = tokenizer.nextToken(); /*IF THE TOKEN IS POSITIONED PAST A CLOSED PARENTHESES, AND A +- OR * IS NEXT ON TOKEN, THE OPERAND IS EXECUTED ON THE LAST TWO COMPLEX OBJECTS ADDED TO THE STACK*/ while( (token.equals("+")) || (token.equals("-")) || (token.equals("*")) ){ operands = token.charAt(0); Complex left = (Complex)stack.pop(); Complex right = (Complex)stack.pop(); Complex solution = (evaluate(left, right, operands) ); stack.push(solution); token=""; if(tokenizer.hasMoreTokens()){ token = tokenizer.nextToken();} }//end while }//end if more tokens }//end if }//end while /*THE FINAL OPERAND HAS BEEN EXECUTED, AND THE COMPLETED SOLUTION IS DISPLAYED ON THE SCREEN*/ Complex finished = (Complex)stack.pop(); System.out.println("The Result is:" + finished.toString() ); }//END MAIN /*DETERMINES WHAT OPERAND TO US, AND EXECUTES THE OPERAND EVALUATION BY PASSING THE INFORMATION TO THE APPROPRIATE METHOD*/ private static Complex evaluate(Complex right, Complex left, char operator) { Complex result = new Complex(); switch (operator) { case '+': result = right.add(left); break; case '-': result = right.subtract(left); break; case '*': result = right.multiply(left); break; }//end switch return result; }//end evaluate }//end class