Из полного пути к файлу выделить только имя файла

std::string data = 'E:\video\100_Greatest_Discoveries\09_fizika.avi'
std::string fileName = '';
int i = data.length() - 1;
while (data[i--] != '\\' ) ;
while (data[i++] != '.' )
    fileName += data[i];

#include <iostream>
#include <string>
using namespace std;
 
 
int main()
{
    std::string data = "E:\\video\\100_Greatest_Discoveries\\09_fizika.avi";
 
    std::string fileName = "";
    int i = data.length() - 1;
 
    while (data[i--] != '\\' );
 
    while (data[++i] != '.')
    fileName += data[i];
 
    cout << fileName << endl;
}

#include <iostream>
#include <string>
using namespace std;
 
int main()
{
    std::string s = "E:\\video\\100_Greatest_Discoveries\\09_fizika.avi";
    std::string fileName;
    int i;
    for(i = s.length(); (s[i] != '\\') && (s[i] != '/') && i >= 0; --i)
    ;
    while (s[++i] != '\0')
        fileName += s[i];
    cout << fileName << endl;
    return 0;
}

#include <boost/filesystem.hpp>
int main()
{
 using namespace std;
 using namespace boost::filesystem;
 
 string data = "E:\\video\\100_Greatest_Discoveries\\09_fizika.avi";
 path p(data);
 cout<<p.leaf()<<endl;// 09_fizika.avi 
 
return 0;
}

int main()
{
using namespace std;
 
  string data = "E:\\video\\100_Greatest_Discoveries\\09_fizika.avi";
  string result= data.substr(data.find_last_of("\\")+1,string::npos);
 
  cout<<result<<endl;
 
return 0;
}

int main()
{
system("chcp 1251");
using namespace std;
 
string data = "E:/video/100_Greatest_Discoveries\\09_fizika.avi";
 
size_t ls= data.find_last_of("\\")+1;
size_t rs= data.find_last_of("/")+1;
 
size_t pos = (ls!=string::npos && ls>rs)?ls:rs;
 
string result= data.substr(pos,string::npos);
 
cout<<result<<endl;
 
system("pause");
return 0;
}
//---------------------------------------------------------------------------

size_t ls= data.find_last_of("\\/")+1;

std::string path ="E:\\video\\100_Greatest_Discoveries\\09_fizika.avi";
std::string file = path.substr( path.rfind('\\')+1 );
std::cout << "File name: " << file << std::endl;