Question

Write a function addStrings(string1, string2) that takes in two decimals as strings and returns a string of their sum. *Simply converting strings to numbers and adding them together isn’t acceptable.* The program must be able to handle large decimals.

Be sure to touch on these when solving for the solution:

• Pad the right side
• Pad the left side
• Make sure string is same length by putting 0’s where it was missing (be careful w/ decimal points)
• Make sure to remove trailing 0’s
• Chunk out each step into it’s own function *NOT REQUIRED BUT CODE LOOKS CLEANER DOING SO*

Please do the solution in either JavaScript or Ruby so that I can understand better.

// let testCase_string1 = '3.92';

// let testCase_string2 = '0.09';

// let testCase2_string1 = '103.00000000909';

// let testCase2_string2 = '0.0000000019101';

// let testCase3_string1 = '1099.999999999990001';

//let testCase3_string2 = '10000000.000000000000000201000';

Answer 1

Please find the code below::

AddDecimalAsString.java

   package classes3;
  
   import java.util.Arrays;
  
   public class AddDecimalAsString {
  
       static String addString(String num1,String num2){
  
           String carry="";
           String result="";
  
           String number1[] = num1.split("\\.");
           String number2[] = num2.split("\\.");
  
  
           if(number1[0].length()>number2[0].length()){
               String zeros="";
               for(int i=0;i<number1[0].length()-number2[0].length();i++){
                   zeros +="0";
               }
               number2[0] = zeros+number2[0];
           }else if(number2[0].length()>number1[0].length()){
               String space="";
               for(int i=0;i<number2[0].length()-number1[0].length();i++){
                   space +="0";
               }
               number1[0] = space+number1[0];
           }
  
  
           if(number1[1].length()>number2[1].length()){
               String zeros="";
               for(int i=0;i<number1[1].length()-number2[1].length();i++){
                   zeros +="0";
               }
               number2[1] = number2[1]+zeros;
           }else if(number2[1].length()>number1[1].length()){
               String space="";
               for(int i=0;i<number2[1].length()-number1[1].length();i++){
                   space +="0";
               }
               number1[1] = number1[1]+space;
           }
  
  
           num1 = number1[0]+"."+number1[1];
           num2 = number2[0]+"."+number2[1];
  
  
           System.out.println("Number 1 : "+num1);
           System.out.println("Number 2 : "+num2);
  
           int d1,d2,res,car=0;
           for(int i=num1.length()-1;i>=0;i--){
               d1=0;
               d2=0;
               if(num1.charAt(i)=='.'){
                   result = "."+result;
                   continue;
               }
  
               d1 = Integer.parseInt(num1.charAt(i)+"");
               d2 = Integer.parseInt(num2.charAt(i)+"");
               res = d1+d2+car;
               car = 0;
               if(res>=10){
                   res = res-10;
                   car = 1;
               }
  
               if(car==1){
                   carry="1"+carry;
               }else{
                   carry=" "+carry;
               }
               result = res+result;
           }
  
           if(car!=0){
               result = car+result;
           }
  
  
           System.out.println();
           System.out.println(">> Output : ");
           System.out.printf("%20s%20s\n"," Carry:",carry+" ");
           System.out.printf("%20s%20s\n","AUGEND:",num1);
           System.out.printf("%20s%20s\n","ADDEND:",num2);
           System.out.printf("%20s%20s\n"," "," --------------------");
           System.out.printf("%20s%20s\n","SUM:",result);
  
  
  
           return result;
       }
       public static void main(String[] args) {
           System.out.println("\n\nReturned result is : "+addString("00.0000001","999999.9999999"));
       }
   }

output: