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  1. /* package whatever; // don't place package name! 
  2. cd "C:\Users\kmsco\Documents\java coding"
  3. "C:\Program Files\Java\jdk-18\bin\javac.exe" SqrtByHand.java
  4. "C:\Program Files\Java\jdk-18\bin\java.exe" SqrtByHand
  5.  
  6. https://i...content-available-to-author-only...e.com/wid9mq*/
  7.  
  8. import java.util.*; // NumberFormat
  9. import java.lang.*;
  10. import java.io.*;
  11. import java.lang.Math;
  12. import java.text.*; // NumberFormat
  13.  
  14. /* Name of the class has to be "Main" only if the class is public. */
  15. class SqrtByHand
  16. {
  17. 	//https://w...content-available-to-author-only...d.com/article/2245549/java-101-class-and-object-initialization-in-java.html
  18. 	static double num = 0;
  19. 	static double pos = 0;
  20.  
  21. 	public SqrtByHand(double test)
  22. 	{
  23. 		this.num = test;
  24. 	}
  25.  
  26. 	public static int digitCounter() // don't call this from main
  27. 	{
  28. 		int count = 0; //, num = 0003452;
  29.  		int wholeNum = (int) num;
  30.  
  31. 		while (wholeNum != 0)
  32. 		{
  33. 			// wholeNum = wholeNum/10
  34. 			wholeNum /= 10;
  35. 			++count;
  36. 		}
  37. 		//System.out.println("Number of digits: " + count);
  38. 		return count;
  39. 	}
  40.  
  41. 	public static double firstStep()
  42. 	{
  43. 		double numDigits = (double) digitCounter();
  44. 		double findFirst = 0;
  45. 		double firstDigit = 0;
  46.  
  47. 		if(numDigits % 2 == 1) // odd
  48. 		{
  49. 			// 71174
  50. 			// 10^(numDigits-1) = 10^4 = 10,000
  51. 			// 71174 % 10,000 = 1174 // 71174-1174 = 70,000 / 10^4 = 7
  52. 			// or 71174 / 10^4 = 7.1174 truncated = Math.round(nontruncated - 0.5f); // https://w...content-available-to-author-only...a.ca/en/computing-science/media-library/teaching-resources/java/truncation-rounding.html
  53. 			// if answer < 100 ans*100+next2
  54.  
  55. 			pos = numDigits - 1;
  56. 			findFirst = num / Math.pow(10,pos);  // 10 ^ num of digits-1; 71174 / 10^4 = 7.1174
  57. 			firstDigit = Math.round(findFirst - 0.5f); // 7 // https://w...content-available-to-author-only...a.ca/en/computing-science/media-library/teaching-resources/java/truncation-rounding.html
  58. 		}
  59.  
  60. 		else //if(numDigits % 2 == 0) // even
  61. 		{
  62. 			// 711740
  63. 			// 10^(numDigits-2) = 10^4 = 10,000
  64. 			// 711740 % 10,000 = 1740 // 711740-1740 = 710,000 / 10^4 = 71
  65. 			// or 711740 / 10^4 = 71.1740 truncated = Math.round(nontruncated - 0.5f); // https://w...content-available-to-author-only...a.ca/en/computing-science/media-library/teaching-resources/java/truncation-rounding.html
  66. 			// if answer < 100 ans*100+next2
  67.  
  68. 			pos = numDigits - 2;
  69. 			findFirst = num / Math.pow(10,pos); // 711740 / 10^4 = 71.174
  70. 			firstDigit = Math.round(findFirst - 0.5f); // 71 // https://w...content-available-to-author-only...a.ca/en/computing-science/media-library/teaching-resources/java/truncation-rounding.html
  71. 		}
  72.  
  73. 		return firstDigit;
  74. 	}
  75.  
  76. 	public static int closestSquareable() // only runs first time
  77. 	{
  78. 		double firstDigit =  firstStep();
  79.  
  80. 		int justUnder = 0, count = 0;
  81. 		for (count = 0; justUnder < firstDigit; count ++) // count*count < firstDigit
  82. 		{
  83. 			justUnder = count * count;
  84. 			/*System.out.println("justUnder = count * count: ");
  85. 			System.out.print(justUnder);
  86. 			System.out.print(" = ");
  87. 			System.out.print(count);
  88. 			System.out.print(" * ");
  89. 			System.out.println(count);*/
  90.  
  91. 			if(justUnder > firstDigit)
  92. 				break;
  93. 		}
  94. 		return count-1;
  95. 	}
  96.  
  97. 	public static double used()
  98. 	{
  99. 		return 0;
  100. 	}
  101.  
  102. 	public static double difference() //(nextPair, answerDoubled) // numbers on the side
  103. 	{
  104. 		return 0; // (nextPair - answerDoubled);
  105. 	}
  106.  
  107. 	public static double next2nums()
  108. 	{
  109. 		double findFirst = num / Math.pow(10,pos); // 71174 / 10^2 = 711.74
  110. 		System.out.println("findFirst = " + findFirst);
  111. 		double selectDigits = Math.round(findFirst - 0.5f); // 711 // https://w...content-available-to-author-only...a.ca/en/computing-science/media-library/teaching-resources/java/truncation-rounding.html
  112. 		System.out.println("selectDigits = " + selectDigits);
  113. 		double next2Digits = num - (selectDigits*Math.pow(10,pos)); // 71174-(711*10^2) = 71100 = 74
  114. 		System.out.println("next2Digits = " + next2Digits);
  115. 		// double used = 
  116.  
  117. 		double next = (difference() * 100) + next2Digits;
  118. 			//for(int alpha=0; alpha<numDigits; alpha++)
  119. 			{
  120.  
  121. 			}
  122.  
  123. 		pos -= 2;
  124.  
  125. 		return next;
  126. 	}
  127.  
  128. 	public static void print()
  129. 	{
  130. 		double closestSquare = closestSquareable()*closestSquareable();
  131. 		NumberFormat formatter = new DecimalFormat("0"); // # = Digit, zero shows as absent;	0 = Digit	// https://d...content-available-to-author-only...e.com/javase/8/docs/api/java/text/DecimalFormat.html#Special%20Pattern%20Characters
  132.  
  133. 		System.out.println();
  134. 		// 266.76
  135. 		System.out.println("√" + num);	// *71174*
  136. 		System.out.println("-" + (formatter.format(closestSquare)) + "\t-> (" +closestSquareable()+ "*" +closestSquareable()+ ")");	// 4 -> (2*2)
  137. 		System.out.println(" ------"); // equals
  138. 		System.out.print(" " +(formatter.format(firstStep()-closestSquare)));	System.out.println(" \u2193"); // difference	// U+2193 = ↓
  139. 		System.out.print(" " +(formatter.format(firstStep()-closestSquare)));	System.out.print(next2nums());	System.out.print("\t-> ");	// /311
  140. 		// 276 -> (46*6)
  141. 		// 3574
  142. 		// 3156 -> (526*6)
  143. 		// 41800 -> (.)
  144. 		// 37289 -> (5327*7)
  145. 		// 451100
  146. 		// 320076 -> (53346*6)
  147. 		// 131024
  148. 	}
  149.  
  150. 	public static void main (String[] args) throws java.lang.Exception
  151. 	{
  152. 		double test = 71174;
  153. 		SqrtByHand number = new SqrtByHand(test);
  154. 		System.out.println("The actual square root of " +test+ " is " +Math.sqrt(test));
  155.  
  156. 		System.out.println(test+ " has " +digitCounter()+ " digits greater than 1.");
  157.  
  158. 		System.out.println("test % digitCounter() = " + (test % digitCounter()));
  159.  
  160. 		System.out.println("test % 100,000 = " + (test % 100000));
  161. 		System.out.println("test % 10,000 = " + (test % 10000));
  162. 		System.out.println("test % 1,000 = " + (test % 1000));
  163. 		System.out.println("test % 100 = " + (test % 100));
  164. 		System.out.println("test % 10 = " + (test % 10));
  165.  
  166. 		System.out.println("test / 100,000 = " + (test / 100000));
  167. 		System.out.println("test / 10,000 = " + (test / 10000));
  168. 		System.out.println("test / 1,000 = " + (test / 1000));
  169. 		System.out.println("test / 100 = " + (test / 100));
  170. 		System.out.println("test / 10 = " + (test / 10));
  171.  
  172. 		print();
  173. 	}
  174. }
Success #stdin #stdout 0.24s 59244KB
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The actual square root of 71174.0 is 266.78455727421704
71174.0 has 5 digits greater than 1.
test % digitCounter() = 4.0
test % 100,000 = 71174.0
test % 10,000 = 1174.0
test % 1,000 = 174.0
test % 100 = 74.0
test % 10 = 4.0
test / 100,000 = 0.71174
test / 10,000 = 7.1174
test / 1,000 = 71.174
test / 100 = 711.74
test / 10 = 7117.4

√71174.0
-4	-> (2*2)
 ------
 3 ↓
 3findFirst = 7.1174
selectDigits = 7.0
next2Digits = 1174.0
1174.0	->
https://ideone.com/NrEElF
language:
Java (HotSpot 12)
created:
7 days ago
visibility:
public

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