README.md

Antosser's really fast "Prime Number Calculator"

Usage

1. Open commandline in the directory containing the executable
2. Execute the app with the following syntax:
   prime <filename> (<amount> [-log] [-binin] [-binout] [-allout]) || <-todec> || <-tobin>
3. Wait for the calculations to end

Parameters

• -log - Saves the progress and speed at any time (basically the console output) to ".log.csv" so it can be futherly opened in Google Sheets or Ms Exel
• -binin - Takes a compressed binary file as input ({filename}.prime)
• -binout - Outputs binary compressed file instead of decimal ({filename}.prime)
• -allout - Outputs both the compressed binary file and the decimal file
• -tobin - Converts the decimal file to compressed binary
• -todec - Converts the binary file to compressed decimal

How it works

std::vector<int> primes = {}; // Create a vector class
for (int i = 2; primes.size() < n; i++) { // Loop until vector's size is n
  int root = sqrt(i) + 1;
  for (int ci : primes) { // Loop trough every know prime
    if (i % ci == 0)
      goto brk; // Number is not prime
    if (ci > root)
      break; // Number is prime
  }
  primes.push_back(i);
  brk:;
}

// Print primes
for (auto i : primes)
  std::cout << i << std::endl;