Problem 1833. Usage of java.math : Add, Multiply, Pow

Created by Richard Zapor

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This challenge is an introduction to the wonderful word of java.math that allows unlimited precision calculations. The primary reference sites are <a href = "http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Number.html">Java Math</a>, <a href = "http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigDecimal.html">Java BigDecimal</a>, and <a href = "http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigInteger.html">Java BigInteger</a>.The usage of BigDecimal functions add, multiply, and pow will be tested.Java Math tutorial: (Simplified summary that is believed correct)<pre class="language-matlab">vd-decimal value, vstr-string, vi-integer value 
xBD=java.math.BigDecimal(vd); % valid vd,vstr,vi creates xBD a BigDecimal variable
import java.math.*; % simplifies statements
xBD=BigDecimal(vstr);
x2pwrBD=xBD.pow(vi); % Invalid: vd,vstr,BD
xplusyBD=xBD.add(BigDecimal(y)); % add input requires BD type
xmultiplyzBD=xBD.multiply(BigDecimal(z)); % multiply input requires BD type
</pre><pre class="language-matlab">To convert java to string of unlimited length can be achieved via java toString or Matlab char
</pre><pre class="language-matlab">xstr=toString(xBD) or xstr=char(xBD) 
</pre>Input: X,Y, function_case [X,Y double or str, function 1:X+Y, 2:X*Y, 3: X^Y(double)Output: z (char variable)Future Challenges:<pre class="language-matlab">1. nchoosek_large (full precision)
2. Next Prime
3. factor_large
</pre>4. <a href = "http://www.mathworks.com/matlabcentral/cody/problems/1854-factorial-unlimited-size-java-math">Factorial</a>

This challenge is an introduction to the wonderful word of java.math that allows unlimited precision calculations. The primary reference sites are <http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Number.html Java Math>, <http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigDecimal.html Java BigDecimal>, and <http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigInteger.html Java BigInteger>.

The usage of BigDecimal functions add, multiply, and pow will be tested.

Java Math tutorial: (Simplified summary that is believed correct)

vd-decimal value, vstr-string, vi-integer value 
  xBD=java.math.BigDecimal(vd);  % valid vd,vstr,vi creates xBD a BigDecimal variable
  import java.math.*;  % simplifies statements
  xBD=BigDecimal(vstr);
  x2pwrBD=xBD.pow(vi); % Invalid: vd,vstr,BD
  xplusyBD=xBD.add(BigDecimal(y)); % add input requires BD type
  xmultiplyzBD=xBD.multiply(BigDecimal(z));  % multiply input requires BD type
  
  To convert java to string of unlimited length can be achieved via java toString or Matlab char
  
  xstr=toString(xBD)  or xstr=char(xBD)

*Input:* X,Y, function_case  [X,Y double or str, function 1:X+Y, 2:X*Y, 3: X^Y(double)

*Output:* z  (char variable)

*Future Challenges:*

1. nchoosek_large (full precision)
  2. Next Prime
  3. factor_large

4. <http://www.mathworks.com/matlabcentral/cody/problems/1854-factorial-unlimited-size-java-math Factorial>

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110 Solutions
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Last Solution submitted on Nov 29, 2021

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3 Comments

3 Comments

J.R.! Menzinger on 19 Aug 2013

Nice problem to learn the use of java inside Matlab.

Richard Zapor on 19 Aug 2013

BigInteger of doubles above 128 does odd things. BigInteger(num2str(v_dbl)) will work up to 2^53. I did not go into BigInteger limitations.

Richard Zapor on 21 Aug 2013

Usage of BigInteger will cause headaches. The Challenge is BigDecimal.

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