View Compilation Error

0_0_25983013_18007.cpp: In member function 'void ma::ini(int, int)':
0_0_25983013_18007.cpp:12:29: error: 'memset' was not declared in this scope
         memset(a,0,sizeof(a));
                             ^
0_0_25983013_18007.cpp: In member function 'void ma::eye()':
0_0_25983013_18007.cpp:31:29: error: 'memset' was not declared in this scope
         memset(a,0,sizeof(a));
                             ^