View Compilation Error

0_0_20911220_3687.cpp:6:1: error: 'define' does not name a type
 define MS(x, y) memset(x, y, sizeof(x))  
 ^
0_0_20911220_3687.cpp: In function 'int main()':
0_0_20911220_3687.cpp:78:16: error: 'MS' was not declared in this scope
         MS(f, 0);  
                ^