View Compilation Error

0_0_17352855_17405.cpp: In function 'int main()':
0_0_17352855_17405.cpp:46:33: error: 'memset' was not declared in this scope
         memset(in, 0, sizeof(in));
                                 ^
0_0_17352855_17405.cpp:55:29: error: 'strlen' was not declared in this scope
             int len=strlen(s);
                             ^