View Compilation Error

0_0_26771700_21745.cpp:6:11: error: expected primary-expression before '=' token
 #define N = 300000
           ^
0_0_26771700_21745.cpp:9:7: note: in expansion of macro 'N'
 int a[N];
       ^
0_0_26771700_21745.cpp: In function 'int main()':
0_0_26771700_21745.cpp:15:16: error: 'a' was not declared in this scope
         memset(a, 0, sizeof(a));
                ^