CODEWITHSUNDEEP
c++xcodemacos
Dani
Dani

Reputation: 19

How to read and write input file and output file

I am trying to run the following program:

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream inFile;
    ofstream outFile;
    double first=1.49, second=2.59, third=3.69, fourth=4.79;
    inFile.open("prices.txt");
    char response;
    if(!inFile.fail())
    {
        cout << "A file by the name prices.txt exists.\n" << "Do you want to continue and overwrite it\n" << " with the new data (y or n);"; cin >> response;
        if(tolower(response) == 'n')
        {
            cout << "The existing file will not be overwritten." << endl;
            return -1;

        }
    }
    outFile.open("prices.txt");
    if (inFile.fail())
    {
        cout << "\n The file does not exist and can not be opened" << endl;
        cout << "The file has been successfully opened for output." << endl;
        outFile << first << "\n" << second << "\n" << fourth << "\n" << endl;
        outFile.close();
        exit(1);
        cout << "The file has been successfully opened for output. " << endl;
        outFile << first << "\n" << second << "\n" << third << "\n" << fourth << endl;
        outFile.close();
        return 0;
    }
}

Yet this program will not write the values to the prices.txt file. If you run the program once it says the file does not exist. Running it a second time says the file is already there and if you want to overwrite it. The thing is searching my Mac I cannot find this file anywhere.

Any ideas what I am doing wrong with running it in Xcode? A friend runs the exact same code in Visual Studio 2008 and it works. Any help is appreciated.

Upvotes: 0

Views: 2484

Answers (2)

josephthomas
josephthomas

Reputation: 3276

You may not have permission to write into the directory that you are trying to save the file too.

Also, there is an error in your program and I am sure if it is there for debugging reasons. You have

    outFile.close();
    exit(1);

But then shortly there after you try to write to the file, then close it again.

Upvotes: 0

Paul R
Paul R

Reputation: 213039

You need to set the working directory for the executable since you are assuming that your data files are in the current working directory. In Xcode 3.x you set this in the first tab of Get Info for the executable. In Xcode 4.x it has been moved, but the principle is the same.

Alternatively you can change your data file paths (e.g. make them absolute) so that you do not make assumptions about the current working directory.

Upvotes: 2

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