View Compilation Error

0_0_20806106_12041.cpp: In function 'int main()':
0_0_20806106_12041.cpp:10:24: error: initializer fails to determine size of 'a'
     arr a[]=new arr[num];
                        ^
0_0_20806106_12041.cpp:10:24: error: array must be initialized with a brace-enclosed initializer