Create Inverse of number.java

Java/Inverse of number.java

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+/*
+Take the following as input.
+A number
+Assume that for a number of n digits, the value of each digit is from 1 to n and is unique. E.g. 32145 is a valid input number.
+
+Write a function that returns its inverse, where inverse is defined as follows
+
+Inverse of 32145 is 12543. In 32145, “5” is at 1st place, therefore in 12543, “1” is at 5th place; in 32145, “4” is at 2nd place, therefore in 12543, “2” is at 4th place.
+
+Print the value returned.
+
+Input Format
+Integer
+
+Constraints
+0 < N < 1000000000
+
+Output Format
+Integer
+
+Sample Input
+32145
+Sample Output
+12543
+Explanation
+Assume that for a number of n digits, the value of each digit is from 1 to n and is unique. E.g. 32145 is a valid input number. 
+Inverse of 32145 is 12543. In 32145, “5” is at 1st place, therefore in 12543, “1” is at 5th place; in 32145, “4” is at 2nd place, 
+therefore in 12543, “2” is at 4th place.
+*/
+
+import java.util.*;
+public class Main {
+    public static void main(String args[]) {
+
+        Scanner scn = new Scanner(System.in);
+		int num = scn.nextInt();
+        int position=0, ans=0;
+
+
+        while(num>0){
+
+
+            position++;
+            int digit = num%10;
+            num=num/10;
+
+            double mult = Math.pow(10,digit-1);
+            int i = (int)Math.round(mult);
+            ans = (int)Math.round(ans + position*mult);
+
+
+        }
+
+        System.out.println(ans);
+
+
+    }
+}
+