View Compilation Error

0_0_16582479_12918.cpp: In function 'int main()':
0_0_16582479_12918.cpp:3:38: error: 'memset' was not declared in this scope
 #define SET(x,y) memset(x,y,sizeof(x))
                                      ^
0_0_16582479_12918.cpp:42:13: note: in expansion of macro 'SET'
             SET(ma,0);
             ^