View Compilation Error

0_0_12680006_6411.cpp: In function `int main()':
0_0_12680006_6411.cpp:3: error: `z' undeclared (first use this function)
0_0_12680006_6411.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12680006_6411.cpp:4: error: expected unqualified-id before "while"
0_0_12680006_6411.cpp:4: error: expected `,' or `;' before "while"