View Compilation Error

0_0_6734966_8202.cpp: In function `int main()':
0_0_6734966_8202.cpp:11: error: `z' undeclared (first use this function)
0_0_6734966_8202.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6734966_8202.cpp:13: error: `y' undeclared (first use this function)
0_0_6734966_8202.cpp:15: error: `x' undeclared (first use this function)
0_0_6734966_8202.cpp:17: error: no post-increment operator for type
0_0_6734966_8202.cpp:21: error: overloaded function with no contextual type information