Doubt in right view

#1

void rightViewUtil(node*root,int level,int *max_level)
{
if(root==NULL)
{
return;
}
if(*max_level<level)
{
cout<data<<" ";
*max_level=level;
}
rightViewUtil(root->right,level+1,max_level);
rightViewUtil(root->left,level+1,max_level);
}
In this max_level id passed by reference.But when passed by parameter output comes wrong.Can you please tell why it is happening.

#2

Hello @Hk199977,

When you pass a variable by reference, the changes made in it’s value stays.
And when you pass it by value then a copy of that variable is made.
So, the changes made in the copy would not reflect back in the original variable.

Here, max_level is used keep track of the maximum level up to which we have traversed in the code.
So, if you will pass it by value, then updates made in it’s value will not visible for other function calls in the call stack.
Hence, leading to wrong error.

Hope, this would help.
Give a like if you are satisfied.

#3

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