Count words in each line of text file in c++ -

i open txt file using argc, argv, , getline. did properly, have number of words per line (the number of lines not known before) , must output them in reverse. meaning bottom line top line. appreciated. code outputs number of words in file:

    #include <iostream>     #include <fstream>     #include <cstring>     using namespace std;      int main(int argc, char *argv[])     {         if(argc < 1){                cerr << "usage: " << argv[0] << "filename.txt" << endl;          }              ifstream ifile(argv[1]);             if(ifile.fail()){             cerr << "could not open file." << endl;             return 1;             }          int n;         ifile >> n;         cout << n;          int numberofwords = 0;           string line;         for(int = 0; <=  n; i++){             getline(ifile, line);             cout << line << endl;         }            size_t i;          if (isalpha(line[0])) {             numberofwords++;         }          (i = 1; < line.length(); i++) {             if ((isalpha(line[i])) && (!isalpha(line[i-1]))) {                 numberofwords++;             }         }            cout<<"the number of words in line : "<<numberofwords<<endl;          return 0; } 

to find number of words per line use std::getline() iterate on each line , use std::stringstream extract each chunk of whitespace-separated input. iterate on each chunk of input , check see if each character alphabetic:

int numberofwords = 0;  (std::string line, word; std::getline(ifile, line); ) {     std::istringstream iss(line);      while (iss >> word)     {         bool alpha = true;          (char c : word)             if (!std::isalpha(c)) alpha = false;          if (alpha) ++numberofwords;     }     std::cout << "number of words on line: " << numberofwords << std::endl;     numberofwords = 0; }