CODEWITHSUNDEEP
cdelphipascal
Flz
Flz

Reputation: 117

Convert C to Pascal

I am converting a code written in C to Pascal. I got doubt in a part that seems to be simple but generated a doubt!

int Length = ...;  
void *FileBase = ...;  
if (Length && FileBase != NULL)
    ....

The above line with the condition "if", it means "Length" and "Filebase" are respectively different from "0" and "Null"?

it is the same as if (Length <> 0) and (FileBase <> Nil) then ???

Upvotes: 0

Views: 1701

Answers (2)

Nickolay Olshevsky
Nickolay Olshevsky

Reputation: 14160

You are right – it should be translated as if (Length <> 0) and (FileBase <> nil).

Upvotes: 1

David Heffernan
David Heffernan

Reputation: 613572

This is not really a Delphi or Pascal question. It's a question about operator precedence in C. There are many references that will tell you about that. For example: http://en.cppreference.com/w/c/language/operator_precedence.

The key point is that != has higher precedence than &&. So the expression

Length && FileBase != NULL

has the same meaning as

Length && (FileBase != NULL)

Since in C values are regarded as true if they are non-zero, in Delphi/Pascal this expression would be:

(Length <> 0) and (FileBase <> nil)

Upvotes: 2

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