View Compilation Error

0_0_24964849_3080.cpp: In function 'int main()':
0_0_24964849_3080.cpp:12:40: error: 'memset' was not declared in this scope
               memset (s , 0 , sizeof(s));
                                        ^
0_0_24964849_3080.cpp:13:28: error: 'strlen' was not declared in this scope
               la = strlen(a);
                            ^