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#include <fstream>
#include <optional>
#include <sstream>
#include <string>
#include <vector>
 
constexpr std::size_t minfields{33};
 
std::optional<std::vector<std::string>> splitStr(const std::string &line,
                                                 const char delimiter = ',')
{
  std::vector<std::string> splitLine;
  splitLine.reserve(minfields);
  std::istringstream ss(line);
  std::string buf;
  unsigned field{0};
  while (std::getline(ss, buf, delimiter)) {
    splitLine.push_back(buf);
    if (field == 3 && buf[0] != 'E' && buf[0] != 'T') {
      return std::nullopt;
    }
    ++field;
  }
  if (splitLine.size() < minfields)
    return std::nullopt;
  return splitLine;
}
 
void copy_selective(std::istream &in, FILE *out)
{
  std::string line;
  while (std::getline(in, line)) {
    auto split = splitStr(line, ';');
    if (split) {
      fprintf(out,
              "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
              split.value()[0].c_str(),
              ",",
              split.value()[1].c_str(),
              ",",
              split.value()[3].c_str(),
              ",",
              split.value()[4].c_str(),
              ",",
              split.value()[5].c_str(),
              ",",
              split.value()[6].c_str(),
              ",",
              split.value()[10].c_str(),
              ",",
              split.value()[9].c_str(),
              ",",
              split.value()[11].c_str(),
              ",",
              split.value()[7].c_str(),
              ",",
              split.value()[32].c_str(),
              "\n");
    }
  }
}
 
int main(int argc, char *argv[])
{
  if (argc >= 3) {
    std::ifstream inFile(argv[1]);
    FILE *outFile{fopen(argv[2], "w")};
    copy_selective(inFile, outFile);
  }
}
 

Main.java:1: error: illegal character: '#'
#include <fstream>
^
Main.java:1: error: class, interface, or enum expected
#include <fstream>
         ^
Main.java:2: error: illegal character: '#'
#include <optional>
^
Main.java:3: error: illegal character: '#'
#include <sstream>
^
Main.java:4: error: illegal character: '#'
#include <string>
^
Main.java:5: error: illegal character: '#'
#include <vector>
^
Main.java:9: error: class, interface, or enum expected
std::optional<std::vector<std::string>> splitStr(const std::string &line,
^
Main.java:13: error: class, interface, or enum expected
  splitLine.reserve(minfields);
  ^
Main.java:14: error: class, interface, or enum expected
  std::istringstream ss(line);
  ^
Main.java:15: error: class, interface, or enum expected
  std::string buf;
  ^
Main.java:16: error: class, interface, or enum expected
  unsigned field{0};
  ^
Main.java:17: error: class, interface, or enum expected
  while (std::getline(ss, buf, delimiter)) {
  ^
Main.java:19: error: class, interface, or enum expected
    if (field == 3 && buf[0] != 'E' && buf[0] != 'T') {
    ^
Main.java:21: error: class, interface, or enum expected
    }
    ^
Main.java:23: error: class, interface, or enum expected
  }
  ^
Main.java:26: error: class, interface, or enum expected
  return splitLine;
  ^
Main.java:27: error: class, interface, or enum expected
}
^
Main.java:32: error: class, interface, or enum expected
  while (std::getline(in, line)) {
  ^
Main.java:34: error: class, interface, or enum expected
    if (split) {
    ^
Main.java:59: error: class, interface, or enum expected
    }
    ^
Main.java:67: error: class, interface, or enum expected
    FILE *outFile{fopen(argv[2], "w")};
    ^
Main.java:68: error: class, interface, or enum expected
    copy_selective(inFile, outFile);
    ^
Main.java:69: error: class, interface, or enum expected
  }
  ^
23 errors

Standard output is empty