View Compilation Error

0_0_8163369_14648.cpp: In function `int main()':
0_0_8163369_14648.cpp:12: error: `C' undeclared (first use this function)
0_0_8163369_14648.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8163369_14648.cpp:12: error: `N' undeclared (first use this function)