Question

Question 39 (1 point) Which one of the following statements can be used to get the fifth character from a string str? char c - str.charAt(4): char c - str[5]: char c = str(4): char c - str.charAt(5):

Answer 1

Q39)

str.charAt(int index) returns the character at the specified index in a string.

The string index begins from 0.
To get the fifth character from the string str, we need to specify
       char c= str.charAt(4);

So in the given options 1st option is correct.

eg:

a	p	p	l	e	s
0	1	2	3	4	5

Here the 5th character is 'e'. Its index is 4.

Q 40. The correct option is 2nd. The program reads the input and concatenates 456 at the end of the input string.

Note: If you give space while giving input, it reads till space and concatenates 456. (see output2)

The complete program with output is shown below:

2 import java.util.Scanner; 3 class Main 4-{ public static void main(String[] args) Scanner in =new Scanner (System.in); System.out.println("enter a number:"); String str = in.next(://next() is a method that can read input till the space & give result till the space str+-456; /* Java string concatenation operator (+) is used to add strings. Here 456 is added at the end of the input string. */ System.out.println(str);

Output: Output1 is input without space and Output 2 is input with space.

Output 1- enter a number: 123 123456 Output 2- enter a number: 1 2 3 1456