I'm converting a code from C to Delphi, but I'm stuck on the last line of this code:
BOOL is_match = FALSE;
unsigned int temp_val;
unsigned int prev_val = 0;
is_match = (temp_val == val);
I can only convert this much:
var
is_match: boolean;
temp_val: cardinal;
prev_val: cardinal;
begin
is_match := false;
prev_val := 0;
is_match := ????
end;
How do I fill in the last assignment?
is_match := temp_val = val;
无论如何,我希望上面的代码只是真实代码的一小部分,因为在将temp_val
与val
进行比较temp_val
未定义temp_val
。
The equality comparison operator in C is ==
. In Delphi the equivalent operator is =
.
So you need to use this code:
is_match := temp_val=val;
Interestingly, as an aside, the C equality operator leads to a very classic and hard to spot bug. It goes like this:
if (x=0)
DoSomething();
What happens here is that =
is the assignment operator and so x
is assigned a value of 0
which is then truth tested. And that returns false and so DoSomething()
is never executed. I believe that this potential confusion is one of the reasons why Pascal chose to use :=
for assignment.
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