Would you help to fix the problem in lines from 31 to 39?

Question

In the header file there are methods etc. for Binary Search Tree as map in c language of programming. This is the header file :
https://code.sololearn.com/cbBRQc5kIklU/#c
And this is the map.c file:
https://code.sololearn.com/chRjOZNNGOLX/#c
which I have problems in lines from 31 to 39?
Would you please help to fix them?

Answer 1

Hello. I think, its here:
“if(mp!=NULL){...}
else if(mp->value>val)....”
if MP not NULL, you fill it, ok; but this IF has ELSE-branch, and you happen there when MP is NULL, and at this time try to get access by empty pointer -> error

Answer 2

Dmitrii ok, seems understandable , would you tell the syntaxis of creating a new node?

Answer 3

Dmitrii so what shall we do?)

Answer 4

Dmitrii how do we make sure that key-value pair is created successfully ?

Answer 5

so, is no need to check equality mp and null, but check equality mp->root and null is a good idea in order to understand, does map empty. In another case, you should create new tree node and connect it to suitable node to left or right

Answer 6

you have it in function which creates new map, when you create root, just realize that 3 lines as function and use it in define function