Last login: Mon Oct 12 13:45:26 on ttys003

The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
(base) MAC:Mon Oct 12:13:45:wrecks> B
(base) MAC:Mon Oct 12:13:45:4240> jshell
|  Welcome to JShell -- Version 14.0.1
|  For an introduction type: /help intro

jshell> int x = 5;
x ==> 5

jshell> // variable types must be known at compile time.

jshell> while(x > 0){x++;}

jshell> x
x ==> -2147483648

jshell> x--;
$4 ==> -2147483648

jshell> x
x ==> 2147483647

jshell> Math.log(214783647, 2)
|  Error:
|  method log in class java.lang.Math cannot be applied to given types;
|    required: double
|    found:    int,int
|    reason: actual and formal argument lists differ in length
|  Math.log(214783647, 2)
|  ^------^

jshell> Math.log(214783647)/Math.log(2)
$6 ==> 27.678308914013897

jshell> Math.log(214783647)/Math.log(2)
$7 ==> 27.678308914013897

jshell> Math.log( 2147483647)/Math.log(2)
$8 ==> 30.999999999328196

jshell> //integers are 32 bits

jshell> byte b = 1;
b ==> 1

jshell> while(b > 0){b++;}

jshell> b
b ==> -128

jshell> b--;
$12 ==> -128

jshell> b
b ==> 127

jshell> short s = 1
s ==> 1

jshell> while(s > 0){s++;}

jshell> s
s ==> -32768

jshell> s--;
$17 ==> -32768

jshell> //short is a 2 bit integer

jshell> short a = 5
a ==> 5

jshell> short b = 6
b ==> 6

jshell> a + b
$20 ==> 11

jshell> Long.MAX_VALUE
$21 ==> 9223372036854775807

jshell> float f = 3.4;
|  Error:
|  incompatible types: possible lossy conversion from double to float
|  float f = 3.4;
|            ^-^

jshell> float f = 3.4f;
f ==> 3.4

jshell> //float is a 32 bit floating point number, IEEE754

jshell> double d = 4.0;
d ==> 4.0

jshell> d = "cows"
|  Error:
|  incompatible types: java.lang.String cannot be converted to double
|  d = "cows"
|      ^----^

jshell> 4*5
$24 ==> 20

jshell> 4 + 5
$25 ==> 9

jshell> 4 - 5
$26 ==> -1

jshell> 4/5
$27 ==> 0

jshell> -4/5
$28 ==> 0

jshell> 4 % 5
$29 ==> 4

jshell> 4**5
|  Error:
|  illegal start of expression
|  4**5
|    ^

jshell> Math.pow(4,5)
$30 ==> 1024.0

jshell> Math.cos(Math.PI)
$31 ==> -1.0

jshell> Math.log(10)
$32 ==> 2.302585092994046

jshell> exp(2.3025)
|  Error:
|  cannot find symbol
|    symbol:   method exp(double)
|  exp(2.3025)
|  ^-^

jshell> Math.exp(2.3025)
$33 ==> 9.999149106262607

jshell> 4.0/5
$34 ==> 0.8

jshell> true
$35 ==> true

jshell> false
$36 ==> false

jshell> 'a'
$37 ==> 'a'

jshell> char q = 'z'
q ==> 'z'

jshell> (int) q
$39 ==> 122

jshell> (char) 945
$40 ==> 'α'

jshell> (char) 946
$41 ==> 'β'

jshell> for(int k = 945; k < 959; k++)
   ...> {
jshell> for(int k = 945; k < 959; k++)
   ...> {b again to see all possible completions; total possible completions: 574>
   ...> System.out.print((char) k);
   ...> }
αβγδεζηθικλμνξ
jshell> for(int k = 945; k < 969; k++)
   ...> {
   ...> System.out.print((char) k);
   ...> }
αβγδεζηθικλμνξοπρςστυφχψ
jshell> for(int k = 945; k < 970; k++)
   ...> {
   ...> System.out.print((char) k);
   ...> }
αβγδεζηθικλμνξοπρςστυφχψω
jshell> (char) 5545
$45 ==> 'ᖩ'

jshell> (char) 6040
$46 ==> 'ម'

jshell>