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Solved 2019 ICSE Computer Science Paper

Class 10 - ICSE Computer Science Solved Papers

Tech Number Program - ICSE 2019 Computer Science

A Tech Number has even number of digits. If the number is split in two equal halves, then the square of sum of these halves is equal to the number itself. Write a program to generate and print all four digits tech numbers.
Example:
Consider the number 3025.
Square of sum of the halves of 3025 = (30 + 25)2
= (55)2
= 3025 is a tech number.

Type 1 Program - Without Function

Java 

import java.util.Scanner;
class Tech{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        for(int i = 1000; i <= 9999; i++){
            int a = i / 100;
            int b = i % 100;
            int s = (a + b) * (a + b);
            if(i == s)
                System.out.print(i + " ");
        }
    }
}

Output

 
 OUTPUT : 
2025 3025 9801

Type 2 Program - User Defined Function

Java 

import java.util.Scanner;

class Tech{
    public static void main(String args[]){
        for(int i = 1000; i <= 9999; i++){
            if(isTech(i))
                System.out.print(i + "\t");
        }
    }
    public static boolean isTech(int n){
        int a = n / 100;
        int b = n % 100;
        int sum = a + b;
        if(n == sum * sum)
            return true;
        return false;
    }
}

Output

 
 OUTPUT : 
2025 3025 9801
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