Eroare de compilare: user.cpp: In function ‘bool evaltree(tree*)’: user.cpp:238:27: error: ‘eval’ was not declared in this scope return eval(node->left) & eval(node->right); ^ user.cpp:240:27: error: ‘eval’ was not declared in this scope return eval(node->left) | eval(node->right); ^ user.cpp:242:29: error: ‘eval’ was not declared in this scope return !eval(node->right); ^ user.cpp:246:1: warning: control reaches end of non-void function [-Wreturn-type] } ^