View Compilation Error

0_0_31832491_4375.cpp: In function 'void getprime()':
0_0_31832491_4375.cpp:4:37: error: 'memset' was not declared in this scope
 #define mm(a,b) memset(a,b,sizeof(a))
                                     ^
0_0_31832491_4375.cpp:14:1: note: in expansion of macro 'mm'
 mm(isprime,false);
 ^