View Compilation Error

0_0_21584938_3443.cpp: In function 'void bianli(tree*, int)':
0_0_21584938_3443.cpp:34:22: error: 'libian' was not declared in this scope
         libian(t->l,2);  
                      ^
0_0_21584938_3443.cpp:36:22: error: 'libian' was not declared in this scope
         libian(t->r,2);  
                      ^