Write C code to check if a given binary tree is a binary search tree or not?

Here is a C program which checks if a given tree is a Binary Search Tree or not…

int isThisABST(struct node* mynode)
{
if (mynode==NULL) return(true);
if (node->left!=NULL && maxValue(mynode->left) > mynode->data)
return(false);
if (node->right!=NULL && minValue(mynode->right) <= mynode->data)
return(false);
if (!isThisABST(node->left) || !isThisABST(node->right))
return(false);

return(true);
}

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