View Compilation Error

0_0_11066832_14122.cpp: In function `int main()':
0_0_11066832_14122.cpp:14: error: `c1' undeclared (first use this function)
0_0_11066832_14122.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11066832_14122.cpp:15: error: `c2' undeclared (first use this function)