I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

#include <iostream>
using namespace std;
 
int main()
{
    string str = "Tech Study";
 
    // you can also use str.length()
    cout << "String Length = " << str.size();
 
    return 0;
}

Result:

String Length = 10