File input output read text file c++ -

my task write program reads text file, prints statistical results contents output file. start asking user input name of input file, , input name of output file. input file can file containing plain text. want read contents of input file, , print output file following information contents of input file. using ms visual studio assignment , don't know if doing right far think have create .cpp input text file , 1 .cpp output file , 1 execution. kinda lost on creating , using text files too. here got:

#include <iostream> #include <fstream> #include <cctype> #include <cstring> using namespace std;  int main() {     char filename[100];     // string filenames     ifstream input;         // file input stream     ofstream output;        // file output stream          {         input.clear();      // clear status flags in stream         cout << "please enter name of input file.\n";         cout << "filename: ";         cin >> filename;         input.open(filename);         if (!input)             cout << "sorry not valid file. try again!\n";     } while (!input);            {         output.clear();     // clear status flags in stream         cout << "please enter name of output file.\n";         cout << "filename: ";         cin >> filename;         output.open(filename);         if (!output)             cout << "sorry not valid file. try again!\n";     } while (!output);       char ch;     int characters = 0;     int letters = 0;     int white_space = 0;     int digits = 0;     int other_characters = 0;     int uppercase = 0;     int lowercase = 0;      while (!input.eof());   // while not end of input file     {         input.get(ch);          if(isalnum(ch))             characters++;         output << ch;          if(isalpha(ch))             ++letters;         output << ch;          if(isspace(ch))             ++white_space;         output << ch;          if(isdigit(ch))             ++digits;         output << ch;          if(ispunct(ch))             ++other_characters;         output << ch;      }     cout << "processing complete\n";      double perc_letters = 0;     double perc_white_space = 0;     double perc_digits = 0;     double perc_other_characters = 0;      cout << "\nstatistics file:" << filename << endl;     cout << "--------------------------------------------------\n";      cout << "total # of charcters in file:\t " << characters << endl;     cout << "\ncategory\thow many in file\t% of file\n";     cout << "--------------------------------------------------\n";     cout << "letters\t" << letters << "\t" << perc_letters << "%" << endl;     cout << "white space\t" << white_space << "\t" << perc_white_space << "%" << endl;     cout << "digits\t" << digits << "\t" << perc_digits << "%" << endl;     cout << "other characters\t" << other_characters << "\t" << perc_other_characters << "%" << endl;     cout << "\n";      input.close();     output.close();      return 0;  } 

it shouldn't make difference if put them in different cpp files, thats making structure of code. not 100% sure on how going assignment if using c++ getline() function handy. can like:

    while (std::getline(file, line)){         if (line[0] == 'v' && line[1] == ' '){             sscanf_s(&line[0], "v %f, &x);} thats gonna store float value in x on line if line starts with: "v "