file name
buff.txt
parentheses tests
x = ((2 + 2)*3)
x = (1 + 2))*3)
y = (z * j)/(b * 8)^2
postfix equation solving
1 2 + 8 *
1 2 + 1 2 * *
8 4 / 8 4 - +
infix to postfix conversion
a + b
a * b
(a + b)*c
a + b * c
(a+b)*(c+d)
full system check
(1 * 8)/4
((2 + 3) - (6 / 3))
(((2*3))) - 1
(1 + 2)) - 3
((1 - 2) + 3
(1+2)-(2-1)/(2-1)-0