Question

write a Java Program to check whether the entered number is Tech number or not

a tech number is a number which having even number of digits ​

Answer 1

CODE :

import java.util.*;

class Tech_number

{

public static void main(String args[])

{

Scanner sc = new Scanner( System.in );

System.out.println("Enter the number");

int n=sc.nextInt();

int c=0;

while(n>0)

{

c++;

n=n/10;

}

if(c%2==0)

System.out.println("Tech number");

else

System.out.print("Not a tech number");

}

}

Explanation:

Take the input and count digits by using while loop .

Then check whether the number of digits is even or not .

Answer 2

Answer:import java.util.Scanner;

classTech

{

pulic static void main(String args[])

{

Scanner sc=new scanner (System.in);

int n,i,a,b,s,sq;

System.out.println("Enter a no.")

n=sc.nextInt();

for(i=1;i<=n;i++)

{

a=i\100;

b=i%100;

s=a+b;

sq=s*s;

if(sq==i)

Sopln(i+" ");

}}}

Explanation:Tech no is a four-digit even no. which when splitted into two equal halves, then the sum of square of these halves are equal to the no. itself. Eg- 3025= 30+25

=55

=(55)2 = 3025