View Compilation Error

0_0_20646798_13186.cpp: In function 'void init()':
0_0_20646798_13186.cpp:6:35: error: 'memset' was not declared in this scope
 #define cl(a) memset(a,0,sizeof(a))
                                   ^
0_0_20646798_13186.cpp:14:5: note: in expansion of macro 'cl'
     cl(a);cl(r);
     ^