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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class SqrtByHand
  9. {
  10.     public static int digitCounter(int num)
  11.     {
  12.         int count = 0; //, num = 0003452;
  13.  
  14.         while (num != 0)
  15.         {
  16.              // num = num/10
  17.               num /= 10;
  18.               ++count;
  19.         }
  20.         System.out.println("Number of digits: " + count);
  21.         return count;
  22.     }
  23.  
  24.     public static int closestSquare(int test)
  25.     {
  26.         int justUnder=0, count=0;
  27.         while (justUnder<test)
  28.         {
  29.             count++;
  30.             justUnder=count*count;
  31.         }
  32.         return count-1;
  33.     }
  34. 	public static void main (String[] args) throws java.lang.Exception
  35. 	{
  36.         int test=9900;
  37.         int closest=closestSquare(test)*closestSquare(test);
  38. 		System.out.println("The closest perfect square to " +test+ " is " +closestSquare(test)+ " because " +closestSquare(test)+ " * " +closestSquare(test)+ " = " +closest);
  39.  
  40.         System.out.println(test+ " has " +digitCounter(test)+ "digits.");
  41. 	}
  42. }
Success #stdin #stdout 0.21s 60476KB
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Standard input is empty
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The closest perfect square to 9900 is 99 because 99 * 99 = 9801
Number of digits: 4
9900 has 4digits.
https://ideone.com/wid9mq
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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