please solve this code and teach me how you solve it ?

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package com.codegym.task.task01.task0123; /* We don't need any extra lines */ public class Solution { public static void main(String[] args) { int a = 10; int b = 15; double c = b + 38; int d = a + 12; double e = 12.3; String s = "s" + a; String s1 = a + "b"; String s2 = "a"; String s3 = s1 + "a"; String s4 = s3 + "b"; System.out.println(c + s4 + s); } }

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Gellert Varga

Level 23 , Szekesfehervar, Hungary

30 March 2021, 09:28

Start with line 20. We want to print these three variables: c, s4, s. So these three variables will definitely be needed for the program to work. Now you first need to look at the c-variable in the code: where it is declared and how. You will find it in line 12: double c = b + 38; This means that also the b-variable is needed to define the c-variable. So you also look for the declaration of the b-variable. You will find in line 11: int b = 15; So the variable b is defined for a specific number. There is no additional variable in its definition. We are now done tracing the c-variable. Mark that lines 12 and 11 are doubtless required for the program to work, you may not delete (comment out) them. Continue this logic with the s4 and s variables as well. Check all the lines needed to determine the value of these variables. Lines that you did not mark and contain declaration of any other variables, are redundant for the program to run. Comment them out with a // at the beginning of the line.