strlen meaning in c++ code example

Example 1: strlen in cpp

#include <cstring>
#include <cstring>

using namespace std;

int main(void) {
  char stringName[] = "This contains the content of your string";
  int stringLength = strlen(stringName);
  cout << "String: " << stringName << endl << "Length of String: " << stringLength << endl;
  
  return 0;
}

Example 2: strlen in cpp

#include <cstring>
#include <iostream>

using namespace std;

int main()
{
    char str1[] = "This a string";
    
    int len1 = strlen(str1);

    cout << "Length of str1 = " << len1 << endl;

    return 0;
}