this program takes a mathematical expression and calculates result step by step.

it supports:

• integer and floating point numbers
• + - / * ^ ( )
• sin(), cos(), tan(), cot(), ln(), e(), log(), abs(), other function can be added easily

input 1:

e(sin(1+3) * log(2^2))

output 1:

0.6340417317497135

input 2:

-(-(2^3))/4+1 

output 2:

  3

input 3:

-(((1+2)*(-3))^(1+1)) 

ouput 3:

-81

input 4:

((1.4+1.6)*10)/100 

output 4:

0.3

some errors will be detected by program such as wrog use of parentheses and more. hree is some inputs that cause erorr:

)(1+3)*2
(((2+5)^2)+4
3+5^
+5^
5/0

for each expression, a cli version of expression-calculate-tree will be printed:

• compile(linux):

find -name *.java > src.txt
javac -d out/ @src.txt

• run:

cd out
java com.company.Main