View Compilation Error

0_0_39155020_27875.cpp: In function 'int main()':
0_0_39155020_27875.cpp:7:25: error: 'strlen' was not declared in this scope
    7 |                 int len=strlen(a),i;
      |                         ^~~~~~
0_0_39155020_27875.cpp:2:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | using namespace std;
0_0_39155020_27875.cpp:8:21: error: 'i' was not declared in this scope
    8 |                 for(i=0;i<len;i++){
      |                     ^