Laguna of Cakel

#include <fstream>

using namespace std;

int main(void)
{
 fstream fOut("gugudan.txt",ios::out);
 int i = 2;
 int j = 1;

 fOut << "==========================================================" << endl;
 fOut << "                            구구단" << endl;
 fOut << "==========================================================" << endl;

 for(i = 2; i <= 9; i = i + 4)
 {
  for(j = 1; j <=9; j++)
   fOut << i << " * " << j << " = " << i * j
    << '\t' << i + 1 << " * " << j << " = " << (i+1) * j
    << '\t' << i + 2 << " * " << j << " = " << (i+2) * j
    << '\t' << i + 3 << " * " << j << " = " << (i+3) * j << endl;

  fOut << "==========================================================" << endl;

 }

 fOut.close();

 return 0;
}

using namespace std;

int main(void)
{
 char cBuf;
 ifstream fIn("file1.txt", ios::in);
 ofstream fOut("file2.txt", ios::out);
 
 if(!fIn)
 {
  cerr << "file1.txt 파일이 없습니다." << endl;
  return -1;
 }

 while(fIn.get(cBuf))
 {
  if(isalpha(cBuf) || cBuf == '\n')
  {
   fOut.put(cBuf);
  }

 }

 fOut.close();
 fIn.close();
 
 return 0;
}