c to FB multiple assignmet is single line

[stan1958]

is multiple assignmet line allowed in FB?
similar to below

C:

first->x4 = second->x1 = (first->x3 + second->x2) * 0.5;


I have converted to
FB:

dim c as double = (first->x3 + second->x2) * 0.5
c = first->x4
c = second->x1

wonder is this the better way

[angros47]

No, multiple assignment is not allowed in FreeBASIC, because in BASIC the operator "=" is also used for comparison, so an expression like

Code: Select all

A = B = C 

will compare B to C, and return -1 if they are equal or 0 if they aren't. So, the value of B is not modified, and the value of A can only be 0 or -1
This applies to other dialects of BASIC, not only to FreeBASIC

in C it's possible to do the double assignment because the operator used for comparison is not "=", but "==" (the operator "=" is used only for assignment, so there is no ambiguity). In BASIC you have to do two separate assignments (don't worry, the resulting compiled code should be identical, with the right optimizations enabled)

[paul doe]

is multiple assignmet line allowed in FB?
similar to below

C:

first->x4 = second->x1 = (first->x3 + second->x2) * 0.5;


I have converted to
FB:

dim c as double = (first->x3 + second->x2) * 0.5
c = first->x4
c = second->x1

wonder is this the better way

No, the C code is equivalent to:

Code: Select all

dim c as double = (first->x3 + second->x2) * 0.5
first->x4 = c
second->x1 = c