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Solved 2020 ICSE Computer Science Paper

Class 10 - ICSE Computer Science Solved Papers

Class Overload Program - ICSE 2020 Computer Science

Design a class to overload a function sum() as follows:
(i) int sum(int a, int b) to calculate and return the sum of all the even numbers in the range a to b.
Sample Input:
a = 14
b = 16
Sample Output:
Sum = 30
(ii) double sum(double n) to calculate and return the product of the following series:
Product = 1.0 × 1.2 × 1.4 × … × N
(iii) int sum(int n) to calculate and return the sum of only odd digits of the number N.
Sample Input:
N = 43961
Sample Output:
Sum = 13
Write the main() method to create an object and invoke the above methods.

Java 

import java.io.*;
class Overload{
    public int sum(int a, int b){
        int s = 0;
        for(int i = a; i <= b; i++){
            if(i % 2 == 0)
                s += i;
        }
        return s;
    }

    public double sum(double n){
        double p = 1.0;
        for(double i = 1.0; i <= n; i += 0.2)
            p *= i;
        return p;
    }
    public int sum(int n){
        int s = 0;
        for(int i = n; i != 0; i /= 10){
            if((i % 10) % 2 == 1)
                s += i % 10;
        }
        return s;
    }

    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Overload obj = new Overload();
        System.out.print("a = ");
        int a = Integer.parseInt(br.readLine());
        System.out.print("b = ");
        int b = Integer.parseInt(br.readLine());
        int result = obj.sum(a, b);
        System.out.println("Sum of the range: " + result);
        System.out.print("n = ");
        double n = Double.parseDouble(br.readLine());
        double product = obj.sum(n);
        System.out.println("Product: " + product);
        System.out.print("n = ");
        int num = Integer.parseInt(br.readLine());
        result = obj.sum(num);
        System.out.println("Sum of odd digits: " + result);        
    }
}

Output

 
 OUTPUT : 
a = 14
b = 16
Sum of the range: 30
n = 5
Product: 2.710780430399311E8
n = 43961
Sum of odd digits: 13
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