// Created by LukArToDo /* ⭐÷÷÷÷÷÷÷Challenge÷÷÷÷÷÷÷÷÷⭐ 👉✍calculator without any operator✍👈 my first challenge description make a calculator without any operator for addition and subtraction, it's easy but in multiplication it will also multiply decimal number like ( 65*5.7) and negative numbers also like (-32*46) and for division like (21/3) &(3/43)&(53/43) WITHOUT ANY USE OF THIS + - * / and ++ , -- basically i want to know core of coding how operator (which i think it's function) works 🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺 ************************************* ENTER FIRST NUMBER ⤵️ hit enter ENTER OPERATOR (+,-,*,/) ⤵️ hit enter ENTER SECOND NUMBER ✔️ press submit 🔸🔸NOTE🔸🔸: 🔹If your choise is +,- or / the numbers need to be INTEGERS 🔹Only if you have chosen * the numbers can be and DECIMAL 🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺🔺 ************************************* */ import java.util.Scanner; public class CalculatorWithotOperators{ static int reminder=0; static String res=""; public static void main(String[] args) { try{ Scanner in=new Scanner(System.in); double ad=in.nextDouble(); String operator=in.next(); double bd=in.nextDouble(); System.out.printf("First number: %s%nOperator: %s%nSecond number: %s%n", String.valueOf(ad),operator,String.valueOf(bd)); checkInput(ad,bd,operator.trim()); in.close(); }catch(Exception e){ System.out.println("Your inputs are incorrect.Try again."); } } static void checkInput(double ad, double bd, String operator) { if(operator.equals("+")||operator.equals("-")||operator.equals("/")) { int a=(int)ad; int b=(int)bd; if(ad!=a || bd!=b) { System.out.println("Your input is incorrect. Please enter a integers."); System.exit(0); } switch(operator) { case "+": System.out.println("Result: ".concat(String.valueOf(add(a,b)))); break; case "-": System.out.println("Result: ".concat(String.valueOf(subtract(a,b)))); break; case "/": System.out.println("Result: ".concat(String.valueOf(divide(a,b)))); break; } } else if(operator.equals("*")) System.out.println(multiple(ad,bd)); else System.out.println("Your input is incorrect. Operator can be: -, +, * or /"); } static int add(int a,int b) { int sum,carry; do{ sum=a^b; carry=(a&b)<< 1; a=sum; b=carry; }while(carry!=0); return sum; } static int subtract(int a, int b){ return add(a,add(~b,1)); } static int multiply(int a,int b){ if(b==0) return 0; else if(b>0) return (add(a,multiply(a, subtract(b,1)))); else return -multiply(a,-b); } static int division(int a,int b) { int temp = 1; int quot = 0; while (b <= a) { b <<= 1; temp <<= 1; } while (temp > 1) { b >>= 1; temp >>= 1; if (a >= b) { a =subtract(a,b); quot=add(quot,temp); } } reminder=a; return quot; } static String multiple(double a, double b){ int countA=0; String s=String.valueOf(a); int dot = s.indexOf('.'); countA = subtract(subtract(s. length(),dot),1); int ai=Integer.parseInt(s.replace (".","")); int countB=0; s=String.valueOf(b); dot=s.indexOf('.'); countB = subtract(subtract(s. length(),dot),1); int bi=Integer.parseInt(s.replace (".","")); res=String.valueOf(multiply (ai,bi)); int pos=add(countA,countB); if(pos==0) return res; return res.substring(0,subtract(res.length(),pos)).concat(".".concat(res.substring(subtract(res.length(),pos)))); } static String divide(int a, int b) { int signB=1; if(b<0) {signB=-1;b=multiply(b,signB);} boolean dot=false; int signA=1; if(a<0){ signA=-1; a=multiply(a,signA); } if(a10) return res; } return res; } static int find(int a, int b) { res=res.concat("0."); int count=0; while(a1) res=res.concat("0"); a=multiply(a,10); } return a; } }

CalculatorWithoutOperators