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Opening files with a twist, C++

Discussion in 'Software Development' started by calculus87, Sep 26, 2003.

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  1. calculus87

    calculus87 Thread Starter

    Joined:
    Sep 4, 2003
    Messages:
    34
    Hello,

    Okay, in my program I open a file and begin to put data in the file. Now before I am finished putting the data in the file I need to use some of the data.

    okay for example
    data in file1:
    3 4

    Now for the next input I need to take the sum of the first two statements. So the next spot in the statement would be 7

    3 4 7

    afterwards I go on inputting data.

    3 4 7 1 ...

    I tried to do a function inside a function, where the outer function opens the file, and begins to input data into it.
    Then the inner function is called. It opens the file and takes the
    first two inputs, does the conversions, adds them, converts them back then inputs the string into the file then exits.
    The outer function then continues inputing into the file.

    When I run my code I am supposed to have a=3 and b =4 but they are blank.

    so my question is this.
    1) can it be done?
    2) here is some of the code that I have tried, any suggestions on how to fix this code?

    Thanks for the help
    ~Ronald
    //**********************
    int main()
    {
    fstream scan;
    scan.open("calcout.txt", ios::eek:ut| ios::in);
    output<<"3 ";
    output<<"4 ";
    output<<getstrings();
    output<<"1 "
    return 0;
    }
    //**********************
    string getstrings()
    {
    string a, b;
    ifstream input2;
    double s1,s2,sum=0;
    string t1;
    stringstream stream;

    input2.open("calcout.txt");
    input2>>a;
    input2>>b;
    cout<<a<<endl<<b<<endl;

    s1=atof(a.c_str());
    s2=atof(b.c_str());
    sum = s1 + s2;

    stream << sum;
    t1 = stream.str();
    input2.close();
    return t1;
    }
     
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