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bt.exe has stopped working

Mishu (13)
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  #include <iostream>
using namespace std;
struct node
{
    node *left;
    int data;
    node *right;
}*root=NULL;
node * add(node *temp,int dat)
{
    temp=new node;
    temp->data=dat;
    temp->left=NULL;
    temp->right=NULL;
    return temp;
}
int siz(node *node)
{
    if(node!=NULL)
    {
        return(siz(node->left)+1+siz(node->right));
    }
    else
        return 0;

}
int main()
{
    add(root,1);
    add(root->left,2);
    add(root->right,3);
    int i=siz(root);
    cout<<i;
}
Peter87 (11234)
What's the point of passing a pointer to add if you never use that pointer's value in the function?
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