Why substring fun is not working ?.......

Question

https://code.sololearn.com/clomkl4j7Bg7/?ref=app

Answer 1

As I understand it, substring takes 2 arguments:

1. The index of the first character.
2. The index of the last character

The range of selection is <first index to last index - 1>. In your case, you should set it to `substring(3, 6)` and the method will return character from index 3, 4 and 5.

Something along this line;

str.substring(i, i + lenofsubstr));

Answer 2

//substring(3,3) returns empty string so
System.out.println(str.substring( i , i+lenofsubstr )); // substring from i, to i+3

Answer 3

Line 13 should be:
System.out.println(str.substring( i , i+lenofsubstr ));