/in/ex4.cpp: In function 'int main()':
/in/ex4.cpp:11:21: error: ISO C++ forbids variable length array 'arr' [-Werror=vla]
     int arr[m+2][n+2];
                     ^
/in/ex4.cpp:11:21: error: ISO C++ forbids variable length array 'arr' [-Werror=vla]
/in/ex4.cpp:17:9: error: expected primary-expression before ')' token
     if ()
         ^
/in/ex4.cpp:18:1: error: expected primary-expression before '}' token
 }
 ^
cc1plus: all warnings being treated as errors