ICSE Computer Application - Class X - 2013 PYQ

String s1 = "good";
String s2 = "world matters";
String str1 = s2.substring(5).replace('t', 'n');
String str2 = s1.concat(str1);

comm = (sale > 15000)? sale * 5 / 100 : 0;

int x = 2, y = 50;
do{
    ++x;
    y -= x++;
}while(x <= 10);
return y;

What is the data type that the following library functions return?

1. isWhitespace(char ch)
2. Math.random()

If int n[] = {1, 2, 3, 5, 7, 9, 13, 16}, what are the values of x and y?

x = Math.pow(n[4], n[2]);
y = Math.sqrt(n[5] + n[7]);

int ctr = 0;
for(int i = 1; i <= 5; i++)
    for(int j = 1; j <= 5; j += 2)
        ++ctr;

State the Java concept that is implemented through:

1. a superclass and a subclass.
2. the act of representing essential features without including background details.

What are the types of casting shown by the following examples?

1. double x = 15.2;
   int y = (int) x;

2. int x = 12;
   long y = x;

Name the method of Scanner class that:

1. is used to input an integer data from the standard input stream.
2. is used to input a String data from the standard input stream.

Write a program that encodes a word into Piglatin. To translate word into Piglatin word, convert the word into uppercase and then place the first vowel of the original word as the start of the new word along with the remaining alphabets. The alphabets present before the vowel being shifted towards the end followed by "AY".

Sample Input 1: London
Output: ONDONLAY

Sample Input 2: Olympics
Output: OLYMPICSAY

Design a class to overload a function series( ) as follows:

1. double series(double n) with one double argument and returns the sum of the series.
   sum = (1/1) + (1/2) + (1/3) + .......... + (1/n)
2. double series(double a, double n) with two double arguments and returns the sum of the series.
   sum = (1/a²) + (4/a⁵) + (7/a⁸) + (10/a¹¹) + .......... to n terms

Using the switch statement, write a menu driven program:

1. To check and display whether a number input by the user is a composite number or not.
   A number is said to be composite, if it has one or more than one factors excluding 1 and the number itself.
   Example: 4, 6, 8, 9...
2. To find the smallest digit of an integer that is input:
   Sample input: 6524
   Sample output: Smallest digit is 2

For an incorrect choice, an appropriate error message should be displayed.