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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.math.BigDecimal;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
        String result = Ideone.solve( new BigDecimal( "12" ) , 80 );
        System.out.println( "result: " + result );
	}
 
	    static String solve ( BigDecimal num , int decimalPlaces )
    {
        BigDecimal toAdd = new BigDecimal( "1.0" );
        BigDecimal currentNumber = new BigDecimal( "0.0" );
 
        for ( int i = 0 ; i <= decimalPlaces ; i++ )
        {
            currentNumber = currentNumber.setScale( i );
 
            System.out.println( currentNumber.toPlainString() + "          >> " + i + "\r" );
            while ( currentNumber.add( toAdd ).pow( 2 ).compareTo( num ) <= 0 )
            {
                currentNumber = currentNumber.add( toAdd );
            }
 
            toAdd = toAdd.divide( BigDecimal.TEN );
        }
 
        return currentNumber.toPlainString();
    }
}

Success #stdin #stdout 0.2s 37780KB

stdin

Standard input is empty

stdout

0          >> 0
3.0          >> 1
3.40          >> 2
3.460          >> 3
3.4640          >> 4
3.46410          >> 5
3.464100          >> 6
3.4641010          >> 7
3.46410160          >> 8
3.464101610          >> 9
3.4641016150          >> 10
3.46410161510          >> 11
3.464101615130          >> 12
3.4641016151370          >> 13
3.46410161513770          >> 14
3.464101615137750          >> 15
3.4641016151377540          >> 16
3.46410161513775450          >> 17
3.464101615137754580          >> 18
3.4641016151377545870          >> 19
3.46410161513775458700          >> 20
3.464101615137754587050          >> 21
3.4641016151377545870540          >> 22
3.46410161513775458705480          >> 23
3.464101615137754587054890          >> 24
3.4641016151377545870548920          >> 25
3.46410161513775458705489260          >> 26
3.464101615137754587054892680          >> 27
3.4641016151377545870548926830          >> 28
3.46410161513775458705489268300          >> 29
3.464101615137754587054892683010          >> 30
3.4641016151377545870548926830110          >> 31
3.46410161513775458705489268301170          >> 32
3.464101615137754587054892683011740          >> 33
3.4641016151377545870548926830117440          >> 34
3.46410161513775458705489268301174470          >> 35
3.464101615137754587054892683011744730          >> 36
3.4641016151377545870548926830117447330          >> 37
3.46410161513775458705489268301174473380          >> 38
3.464101615137754587054892683011744733880          >> 39
3.4641016151377545870548926830117447338850          >> 40
3.46410161513775458705489268301174473388560          >> 41
3.464101615137754587054892683011744733885610          >> 42
3.4641016151377545870548926830117447338856100          >> 43
3.46410161513775458705489268301174473388561050          >> 44
3.464101615137754587054892683011744733885610500          >> 45
3.4641016151377545870548926830117447338856105070          >> 46
3.46410161513775458705489268301174473388561050760          >> 47
3.464101615137754587054892683011744733885610507620          >> 48
3.4641016151377545870548926830117447338856105076200          >> 49
3.46410161513775458705489268301174473388561050762070          >> 50
3.464101615137754587054892683011744733885610507620760          >> 51
3.4641016151377545870548926830117447338856105076207610          >> 52
3.46410161513775458705489268301174473388561050762076120          >> 53
3.464101615137754587054892683011744733885610507620761250          >> 54
3.4641016151377545870548926830117447338856105076207612560          >> 55
3.46410161513775458705489268301174473388561050762076125610          >> 56
3.464101615137754587054892683011744733885610507620761256110          >> 57
3.4641016151377545870548926830117447338856105076207612561110          >> 58
3.46410161513775458705489268301174473388561050762076125611160          >> 59
3.464101615137754587054892683011744733885610507620761256111610          >> 60
3.4641016151377545870548926830117447338856105076207612561116130          >> 61
3.46410161513775458705489268301174473388561050762076125611161390          >> 62
3.464101615137754587054892683011744733885610507620761256111613950          >> 63
3.4641016151377545870548926830117447338856105076207612561116139580          >> 64
3.46410161513775458705489268301174473388561050762076125611161395890          >> 65
3.464101615137754587054892683011744733885610507620761256111613958900          >> 66
3.4641016151377545870548926830117447338856105076207612561116139589030          >> 67
3.46410161513775458705489268301174473388561050762076125611161395890380          >> 68
3.464101615137754587054892683011744733885610507620761256111613958903860          >> 69
3.4641016151377545870548926830117447338856105076207612561116139589038660          >> 70
3.46410161513775458705489268301174473388561050762076125611161395890386600          >> 71
3.464101615137754587054892683011744733885610507620761256111613958903866030          >> 72
3.4641016151377545870548926830117447338856105076207612561116139589038660330          >> 73
3.46410161513775458705489268301174473388561050762076125611161395890386603380          >> 74
3.464101615137754587054892683011744733885610507620761256111613958903866033810          >> 75
3.4641016151377545870548926830117447338856105076207612561116139589038660338170          >> 76
3.46410161513775458705489268301174473388561050762076125611161395890386603381760          >> 77
3.464101615137754587054892683011744733885610507620761256111613958903866033817600          >> 78
3.4641016151377545870548926830117447338856105076207612561116139589038660338176000          >> 79
3.46410161513775458705489268301174473388561050762076125611161395890386603381760000          >> 80
result: 3.46410161513775458705489268301174473388561050762076125611161395890386603381760007

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