问题

>> k+5|2
in> k+5|2

out> 5
------------------------

>> 5|2+a
in> 5|2+a

out> (0+2*a)|2
------------------------

已修复部分.  Calculator.cpp 中调用 A.ChangeInfix_InModeFraction();

temp = A.ChangeInfix_InModeFraction();
//temp = A.ChangeSymbolicInfix_InModeFraction();//仍有BUG
//temp = A.ChangeSymbolicInfix();

但还是有问题

>> k+(-1|2)*(-5)
in> k+(-1|2)*(-5)

out> (2*k+5)|2
------------------------

>> (-1|2)*(-5)+k
in> (-1|2)*(-5)+k

out> 5|2
------------------------

>> K+5|2
in> K+5|2

out> (2*K+5)|2
------------------------

>> 5|2+k
in> 5|2+k

out>
------------------------

>> (2*k+5)|2-1|8*10
in> (2*k+5)|2-1|8*10

out> -5|4
------------------------

现在基本上解决.

>> :version

Version: 0.573

>> (2*k+5)|2-1|8*10
in> (2*k+5)|2-1|8*10

out> 2*k/2+1.250
------------------------

>> :mode fraction
Switch into fraction calculating mode.
e.g., 1/2+1/3 will return 5/6

>> (2*k+5)|2-1|8*10
in> (2*k+5)|2-1|8*10

out> (4*2*k+20-10)|8
------------------------

>>

不过没有化简.