View Compilation Error

0_0_21959789_21977.cpp: In function 'int main()':
0_0_21959789_21977.cpp:9:5: error: 'x' was not declared in this scope
     x[i]=i;
     ^
0_0_21959789_21977.cpp:12:14: error: 'x' was not declared in this scope
 if(y=0)cout<<x[n-1]<<endl;
              ^
0_0_21959789_21977.cpp:14:11: error: 'x' was not declared in this scope
     cout<<x[y-1];
           ^