Can someone fix my c++ code?

Question

my c++ code has a warning and I don't know how to fix it

https://code.sololearn.com/cQFeNHoozZi5/?ref=app

Answer 1

Gibran Daffa
Then you could use something like bool & return false instead. But I don't think NULL will work in this context.

https://stackoverflow.com/questions/67347566/how-to-properly-return-null-empty-object-in-c

Answer 2

Just replace NULL with 0.

Answer 3

Create (by calling default constructor) and return TVAL.

Line 56

return TVAL();

Answer 4

Ipang if value has 0, then it will give the value that has been stored with a certain key (but there is no the valid value for the key)

On line 77 (in my code) value 0 has been set for "index 3"

Answer 5

Ipang sorry my english is bad,

Like this:
myMap->set("index 3", 0);

// will give you 0 value that same as with "index 3" value if the return value is TVAL();
myMap->get("index 4");

I want the value will give like null or something else

Answer 6

Oh it's okay, now I clearly understood that's what matters ...

Well, Mirielle & Scott had given you good advice. Both are applicable the choice is yours :D

Answer 7

Scott D if the TVAL is not int, the return 0 will be error

Answer 8

What did you mean Gibran Daffa ?

Answer 9

In line 56 rather than returning a non-pointer type, which is Null you shall to return the boolean value false or the number 0(zero) to fix you problem simply and to protect you the compiler from failure.