Catch exception with a do-nothing block that permits processing to continue - C++ Statement

C++ examples for Statement:try catch

  1. HOME
  2. C++
  3. Statement
  4. try catch

Description

Catch exception with a do-nothing block that permits processing to continue

Demo Code

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <iomanip>
using namespace std;
int main()/*from  www  .  j ava2s . c o  m*/
{
   char response;
   string filename = "prices.dat";
   ifstream inFile;
   ofstream outFile;
   try  // open a basic input stream to check whether the file exists
   {
      inFile.open(filename.c_str());
      if (inFile.fail()) throw 1;
      cout << filename << " currently exists.\nDo you want to overwrite it with the new data (y or n): ";
      cin  >> response;
      if (tolower(response) == 'n')
      {
         inFile.close();
         cout << "The existing file has not been overwritten." << endl;
         exit(1);
      }
   }
   catch(int e) {};  // a do-nothing block that permits processing to continue
   try
   {
      outFile.open(filename.c_str());
      if (outFile.fail()) throw filename;
      outFile << setiosflags(ios::fixed) << setiosflags(ios::showpoint) << setprecision(2);
      // write the data to the file
      outFile << "M " << 9.95 << endl << "B " << 3.2 << endl << "A " << 1.08 << endl;
      outFile.close();
      cout << filename << " has been successfully written." << endl;
      return 0;
   }
   catch(string e)
   {
      cout << filename << " was not opened for output and has not been written." << endl;
   }
}

Result


Related Tutorials