View Compilation Error

0_0_16680219_15617.cpp:3:7: error: 'MAX' does not name a type
 const MAX=1001;
       ^
0_0_16680219_15617.cpp:4:7: error: 'MAX' was not declared in this scope
 int a[MAX];
       ^
0_0_16680219_15617.cpp: In function 'int main()':
0_0_16680219_15617.cpp:15:9: error: 'a' was not declared in this scope
    cin>>a[j];
         ^
0_0_16680219_15617.cpp:16:17: error: 'a' was not declared in this scope
  cout<<maxnum(n,a);
                 ^