View Compilation Error

0_0_39308538_26835.cpp: In function 'int main()':
0_0_39308538_26835.cpp:9:22: error: 'strlen' was not declared in this scope
    9 |                 len1=strlen(s1);
      |                      ^~~~~~
0_0_39308538_26835.cpp:3:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include<iostream>
  +++ |+#include <cstring>
    3 | using namespace std;