View Compilation Error

0_0_38338294_29698.cpp: In function 'int main()':
0_0_38338294_29698.cpp:12:3: error: 's' was not declared in this scope
   s=0;
   ^
0_0_38338294_29698.cpp:20:26: error: 'a' was not declared in this scope
   cout<<setprecision(2)<<a[1]<<endl;
                          ^