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  1. #include <fstream>
  2. #include <regex>
  3. #include <string>
  4. #include <iostream>
  5. #include <cstdlib>
  6.  
  7.  
  8. int main(int argc, char **argv) {
  9.     using namespace std;
  10.  
  11.     if (argc <= 1) {
  12.         cerr << "File name required" << endl;
  13.         return -1;
  14.     } 
  15.  
  16.     ifstream stream(argv[1], ios::in);
  17.     if (!stream.is_open()) {
  18.         cerr << "Could not open file " << argv[1] << endl;
  19.         return -1;
  20.     }
  21.  
  22.     regex rx("(\\w+):(\\d+)\\$");
  23.     int book_counter = 0;
  24.     string line;
  25.     while (getline(stream, line)) {
  26.         smatch results;
  27.         if (regex_search(line, results, rx)) {
  28.             auto book_name = results.str(1);
  29.             auto book_count = atoi(results.str(2).data());
  30.             book_counter += book_count;
  31.  
  32.             cout << "Entry added: " << book_name << ", count " << book_count << endl;
  33.         }
  34.     }
  35.  
  36.     cout << "Total books: " << book_counter << endl;
  37.  
  38.     return 0;
  39. }
  40.  
Runtime error #stdin #stdout #stderr 0s 15344KB
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Standard input is empty
stdout
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Standard output is empty
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File name required
https://ideone.com/qhJSHJ
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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