View Compilation Error

0_0_38593000_19105.cpp: In function 'int main()':
0_0_38593000_19105.cpp:10:9: error: 'strlen' was not declared in this scope
   len = strlen(c);
         ^~~~~~
0_0_38593000_19105.cpp:10:9: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38593000_19105.cpp:2:1:
+#include <cstring>
 using namespace std;
0_0_38593000_19105.cpp:10:9:
   len = strlen(c);
         ^~~~~~