View Compilation Error

0_0_10128373_27839.cpp: In function `int main()':
0_0_10128373_27839.cpp:13: error: `liu' undeclared (first use this function)
0_0_10128373_27839.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10128373_27839.cpp:13: error: `w' cannot be used as a function