jshell> /Users/morrison/20202021/T1/4240 
|  Invalid command: /Users/morrison/20202021/T1/4240
|  Type /help for help.

jshell> BigInteger b = new BigInteger("3259083589034598098349081234");
b ==> 3259083589034598098349081234

jshell> b.pow(2)
$2 ==> 10621625840314637110081394314323910349609643571930962756

jshell> b.pow(20)
$3 ==> 18277213628825885896045835900860696732039967323585849401870488635982342695966087046937093452215500836109450887210283726324578729936895280638902188306051488192935191579622442421318768526613817737360188231809252630771731092364693461938592501379839051019106679340086362946264003928035001358448494721107491755779577360406750057481287834038970430207915758427013200166441115343808921191283757714238242142930812023876870250614116833655763971997393048974963629489387258733767965599540101815425491390764542214441433432248629343619946201409824522980543798706176

jshell> BigInteger two = new BigInteger(2);
|  Error:
|  BigInteger(long) has private access in java.math.BigInteger
|  BigInteger two = new BigInteger(2);
|                   ^---------------^

jshell> BigInteger two = BigInteger.valueOf(2)
two ==> 2

jshell> two.pow(1000)
$5 ==> 10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376

jshell> BigInteger three = BigInteger.valueOf(3)
three ==> 3

jshell> two + three
|  Error:
|  bad operand types for binary operator '+'
|    first type:  java.math.BigInteger
|    second type: java.math.BigInteger
|  two + three
|  ^---------^

jshell> two.add(three)
$7 ==> 5

jshell> two.subtract(3)
|  Error:
|  incompatible types: int cannot be converted to java.math.BigInteger
|  two.subtract(3)
|               ^

jshell> two.subtract(three)
$8 ==> -1

jshell> two.multiply(three)
$9 ==> 6

jshell> two.multiply(three).getClass()
$10 ==> class java.math.BigInteger

jshell> two.divide(three)
$11 ==> 0

jshell> BigInteger p = BigInteger.ONE;
p ==> 1

jshell> for(int k = 1; k <= n; k++){p = p.multiply(BigInteger.valueOf(k));}
|  Error:
|  cannot find symbol
|    symbol:   variable n
|  for(int k = 1; k <= n; k++){p = p.multiply(BigInteger.valueOf(k));}
|                      ^

jshell> n = 50
|  Error:
|  cannot find symbol
|    symbol:   variable n
|  n = 50
|  ^

jshell> int n = 50;
n ==> 50

jshell> for(int k = 1; k <= n; k++){p = p.multiply(BigInteger.valueOf(k));}

jshell> p
p ==> 30414093201713378043612608166064768844377641568960512000000000000

jshell> p.doubleValue()
$16 ==> 3.0414093201713376E64

jshell> p.intValue()
$17 ==> 0

jshell> p.gcd(BigInteger.valueOf(7776))
$18 ==> 7776

jshell> p.gcd(BigInteger.valueOf(111))
$19 ==> 111

jshell> p.gcd(BigInteger.valueOf(343221))
$20 ==> 3

jshell> /exit
|  Goodbye