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ICSE Class 10 Computer Applications Question 22 of 30

Solved Sample Paper 4 — Question 22

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22
Question

Question 2(ii)

If

String x = "Computer";	
String y = "Science";

What will the following return?

(a) System.out.print(x.substring(2,6));

(b) System.out.print(x.indexOf(x.charAt(5)));

Answer

(a)

Output
mput
Explanation

The substring() method returns a substring beginning from the startindex and extending to the character at index endIndex - 1. Here, startindex is 2 and end index is 5 (6 - 1). Since the string starts from index 0, the extracted substring is "mput". Thus, "mput" is printed on the screen.

(b)

Output
5
Explanation

charAt() method returns a character from the string at the index specified as its argument. indexOf() method returns the index of the first occurrence of the specified character within the string or -1 if the character is not present. Thus, the given expression is evaluated as follows:

x.indexOf (x.charAt (5) )
⟹ x.indexOf ( 't' )
⟹ 5