View Compilation Error

85647_0_21962.cpp: In function `int main()':
85647_0_21962.cpp:6: error: `y' undeclared (first use this function)
85647_0_21962.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
85647_0_21962.cpp:10: error: `z' undeclared (first use this function)