How do I fix these syntax errors ?

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C++

Eclipse

I was asked to write a prgram that should do the following;
- build a binary search tree using arrays and pointers. The values stored at the nodes are real numbers.
- Travers the binary tree in the usual 3 ways: inorder, pre order and post oreder.

So before directly going to write the whole program, I wanted to at least write one using only pointers. Then if it works, I would add the requierd lines so that the code can build the BST either using pointers or an array depending on the users choice.

Down belowe is the code I've tried, and the probleme is that I don't know how to fix the syntax errors in the functions in the case statements.

What I have tried:

#include <iostream>
using namespace std;

struct node {
	float info;
	node * left;
	node * right;
	};

typedef node *tree;    // to store the address of the root node.

void build(node *t, float x){
	if (t == NULL){
		t = new node;
		t -> info = x;
		t -> left =   NULL;
		t -> right = NULL;
    }
	else{
		if (t -> info >= x)
			build (t -> left, x);
		else
			build(t-> right, x);
	}
}


void inorder(tree t){
	if (t -> left != NULL)
		inorder (t -> left);
	cout << t -> info <<" ";
	if (t -> right != NULL)
		inorder (t -> right);
}


void preorder(tree t){
	if (t != NULL){
		cout << t -> info <<" ";
		preorder(t -> left);
		preorder(t -> right);
	}
}

void postorder(tree t){
	if (t -> left != NULL)
		postorder(t -> left);
    if (t -> right != NULL)
    	postorder(t -> right);
    cout << t -> info <<" ";
}

int main() {
b:	cout << "Choose among the following actions" << endl;
	cout << "1. Build a binary search tree"<< endl;
	cout << "2. Traverse the tree in order"<< endl;
	cout << "3. Traverse the tree in pre order"<< endl;
	cout << "4. Traverse the tree in post order"<< endl;
	cout << "5. Quit"<< endl;

	float s;

	int choice;
	cin >> choice;

	switch(choice){
	case 1:
		build(node*,s);
		break;
	case 2:
		inorder(node*);
		break;
	case 3:
		preorder(node*);
		break;
	case 4:
		postorder(node*);
		break;
	case 5:
		goto a;
		break;
	default :
		goto b;
		break;

	}

a:	return 0;
}