View Compilation Error

0_0_20917385_32600.cpp: In function 'void match_marry()':
0_0_20917385_32600.cpp:14:31: error: 'memset' was not declared in this scope
  memset (match,0,sizeof(match));
                               ^
0_0_20917385_32600.cpp: In function 'int main()':
0_0_20917385_32600.cpp:50:29: error: 'memset' was not declared in this scope
   memset (str,0,sizeof (str));
                             ^