View Compilation Error

0_0_30259993_14619.cpp: In function 'void stirling()':
0_0_30259993_14619.cpp:15:31: error: 'memset' was not declared in this scope
     memset(data,0,sizeof(data)); 
                               ^
0_0_30259993_14619.cpp: In function 'void initial(int)':
0_0_30259993_14619.cpp:57:29: error: 'memset' was not declared in this scope
     memset(a.m,0,sizeof(a.m));
                             ^