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@@ -0,0 +1,120 @@
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+public class OrderOfOperations {
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+ ArrayList<String> contents;
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+ String item;
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+ OrderOfOperations check;
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+
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+ public static void main (String[] args){
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+ Scanner input = new Scanner(System.in);
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+ System.out.println("Enter an operation: ");
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+ String a = input.nextLine();
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+ OrderOfOperations go = new OrderOfOperations();
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+ a = go.brackets(a);
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+ System.out.println("Result: "+a);
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+ }
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+
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+ public String brackets(String s){ //method which deal with brackets separately
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+ check = new OrderOfOperations();
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+ while(s.contains(Character.toString('('))||s.contains(Character.toString(')'))){
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+ for(int o=0; o<s.length();o++){
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+ try{ //i there is not sign
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+ if((s.charAt(o)==')' || Character.isDigit(s.charAt(o))) //between separate brackets
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+ && s.charAt(o+1)=='('){ //or number and bracket,
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+ s=s.substring(0,o+1)+"*"+(s.substring(o+1)); //it treat it as
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+ } //a multiplication
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+ }catch (Exception ignored){} //ignore out of range ex
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+ if(s.charAt(o)==')'){ //search for a closing bracket
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+ for(int i=o; i>=0;i--){
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+ if(s.charAt(i)=='('){ //search for a opening bracket
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+ String in = s.substring(i+1,o);
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+ in = check.recognize(in);
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+ s=s.substring(0,i)+in+s.substring(o+1);
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+ i=o=0;
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+ }
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+ }
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+ }
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+ }
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+ if(s.contains(Character.toString('('))||s.contains(Character.toString(')'))||
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+ s.contains(Character.toString('('))||s.contains(Character.toString(')'))){
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+ System.out.println("Error: incorrect brackets placement");
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+ return "Error: incorrect brackets placement";
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+ }
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+ }
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+ s=check.recognize(s);
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+ return s;
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+ }
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+
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+ public String recognize(String s){ //method divide String on numbers and operators
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+ PutIt putIt = new PutIt();
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+ contents = new ArrayList<String>(); //holds numbers and operators
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+ item = "";
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+ for(int i=s.length()-1;i>=0;i--){ //is scan String from right to left,
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+ if(Character.isDigit(s.charAt(i))){ //Strings are added to list, if scan finds
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+ item=s.charAt(i)+item; //a operator, or beginning of String
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+ if(i==0){
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+ putIt.put();
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+ }
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+ }else{
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+ if(s.charAt(i)=='.'){
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+ item=s.charAt(i)+item;
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+ }else if(s.charAt(i)=='-' && (i==0 || (!Character.isDigit(s.charAt(i-1))))){
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+ item=s.charAt(i)+item; //this part should recognize
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+ putIt.put(); //negative numbers
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+ }else{
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+ putIt.put(); //it add already formed number and
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+ item+=s.charAt(i); //operators to list
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+ putIt.put(); //as separate Strings
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+ if(s.charAt(i)=='|'){ //add empty String to list, before "|" sign,
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+ item+=" "; //to avoid removing of any meaningful String
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+ putIt.put(); //in last part of result method
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+ }
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+ }
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+ }
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+ }
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+ contents = putIt.result(contents, "^", "|"); //check Strings
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+ contents = putIt.result(contents, "*", "/"); //for chosen
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+ contents = putIt.result(contents, "+", "-"); //operators
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+ return contents.get(0);
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+ }
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+ public class PutIt{
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+ public void put(){
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+ if(!item.equals("")){
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+ contents.add(0,item);
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+ item="";
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+ }
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+ }
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+
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+public ArrayList<String>result(ArrayList<String> arrayList, String op1, String op2){
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+ int scale = 10; //controls BigDecimal decimal point accuracy
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+ BigDecimal result = new BigDecimal(0);
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+ for(int c = 0; c<arrayList.size();c++){
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+ if(arrayList.get(c).equals(op1)|| arrayList.get(c).equals(op2)){
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+ if(arrayList.get(c).equals("^")){
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+ result = new BigDecimal(arrayList.get(c-1)).pow(Integer.parseInt(arrayList.get(c+1)));
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+ }else if(arrayList.get(c).equals("|")){
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+ result = new BigDecimal(Math.sqrt(Double.parseDouble(arrayList.get(c+1))));
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+ }else if(arrayList.get(c).equals("*")){
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+ result = new BigDecimal(arrayList.get(c-1)).multiply
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+ (new BigDecimal(arrayList.get(c+1)));
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+ }else if(arrayList.get(c).equals("/")){
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+ result = new BigDecimal(arrayList.get(c-1)).divide
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+ (new BigDecimal(arrayList.get(c+1)),scale,BigDecimal.ROUND_DOWN);
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+ }else if(arrayList.get(c).equals("+")){
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+ result = new BigDecimal(arrayList.get(c-1)).add(new BigDecimal(arrayList.get(c+1)));
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+ }else if(arrayList.get(c).equals("-")){
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+ result = new BigDecimal(arrayList.get(c-1)).subtract(new BigDecimal(arrayList.get(c+1)));
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+ }
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+ try{ //in a case of to "out of range" ex
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+ arrayList.set(c, (result.setScale(scale, RoundingMode.HALF_DOWN).
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+ stripTrailingZeros().toPlainString()));
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+ arrayList.remove(c + 1); //it replace the operator with result
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+ arrayList.remove(c-1); //and remove used numbers from list
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+ }catch (Exception ignored){}
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+ }else{
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+ continue;
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+ }
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+ c=0; //loop reset, as arrayList changed size
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+ }
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+ return arrayList;
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+ }
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+ }
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+}
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Jonathan Hinds
6 years ago