简单交互式页面的思考（C）

while (ch!=5)
	{
		printf("------options list:\n");
		printf("------Intert     (1)\n");
		printf("------Delete     (2)\n");
		printf("------Find key   (3)\n");
		printf("------Print tree (4)\n");
		printf("------out        (5)\n");
		printf("------option:");
		scanf("%d",&ch);
		switch(ch)
		{
            case 1:
				printf("Enter the key:");
				scanf("%d",&key);
				t=insertNode(t,key);
				break;
			case 2:
				printf("Delete value:");
				scanf("%d",&key);
				t=deleteNode(t,key);
				break;
			case 3:
				printf("find  value:\n");
				scanf("%d",&key);
				if (findNode(t,key)!=NULL)
					printf("%d is in the tree\n",key);
				else
					printf("%d is not in the tree\n",key);
				break;
			case 4:
				printf("\nprinting-inorder (i)\nprinting-preorder (r)\nprinting-postorder (p):\n");
				getchar();
				scanf("%c",&temp);
				if (temp=='i'){
					printf("Inorder:");
					printInorder(t);
				}
				else if(temp=='r')
				{
					printf("Preorder:");
					printPreorder(t);
				}
				else
				{
					printf("Postorder:");	
					printPostorder(t);
				}
				printf("\n");
				break;
			case 5:
				printf("Thanks Bye!\n");