read_file_name_using_string.cpp

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

int main(int argc, char* argv[])
{
    string n;
    n=argv[1];
    int nn=n.find(".");
    string num(n,0,nn);
    int int_n;
    int_n = atoi(num.c_str());
    cout <<"strin :: " << num << "  int:: " << int_n << endl;
    return 0;
}