View Compilation Error

0_0_32866211_15515.cpp: In function 'void stirling()':
0_0_32866211_15515.cpp:15:31: error: 'memset' was not declared in this scope
     memset(data,0,sizeof(data));  
                               ^
0_0_32866211_15515.cpp: In function 'void initial(int)':
0_0_32866211_15515.cpp:57:26: error: 'memset' was not declared in this scope
  memset(a.m,0,sizeof(a.m));
                          ^