View Compilation Error

0_0_30523777_7218.cpp: In function 'int main()':
0_0_30523777_7218.cpp:13:27: error: 'strlen' was not declared in this scope
         int len = strlen(s);
                           ^
0_0_30523777_7218.cpp:77:29: error: 'memset' was not declared in this scope
         memset(s,0,sizeof(s));
                             ^