Help with input errors on c++!

Discussion in 'Mac Programming' started by WinkeyFaced, Sep 19, 2011.

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  1. WinkeyFaced, Sep 19, 2011
    Last edited by a moderator: Sep 19, 2011

    WinkeyFaced macrumors newbie

    Joined:
    Sep 19, 2011
    #1
    My goal here is to read a file (word.txt) and then output them added. the challenge is to skip over the lines that have words in them and just add the numbers. I really need help with this part and where to put it in my program

    Code:
    #include <iostream>
#include <fstream>
#include <iomanip>
#include <sstream>

using namespace std;

int main() 
{
   int n;
   int total;
   int count;
   double average;
   string filename;
   
    cout << "Please enter the filename: ";
    getline(cin, filename); //getting possibly more than one word for filename
    cout << endl;
    cout << "Opening " << filename << "." << endl;
    
    ifstream file(filename.c_str());

    if (!file.good()) //if the file isn't there
    {
        cout << "Sorry, I can't find that file." << endl;
    return 0;
    }
    
    else //if the file is there
    {
     while (!file.eof()) //while the file hasn't ended
     {
         
         file >> n;
         total += n; //sums all numbers
         count++; //counts the numbers
     }
         
     average = total / count;
         cout << "The sum is: " << total << endl;
         cout << "The average is: " << average  << endl;
         cout << "The total amount of numbers is: " << count << endl;
     
     }

    }
     
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  2. lloyddean, Sep 19, 2011

    lloyddean macrumors 6502a

    Joined:
    May 10, 2009
    Location:
    Des Moines, WA
    #2
    This may give you an idea of how you might accomplish your stated goal -

    Code:
    void getInput(const std::string& strPrompt, const std::string& strReprompt, int& t)
{
    using std::cin;
    using std::cout;
    using std::flush;
    using std::endl;
    
    do {
        cout << strPrompt << ": " << flush;
        if ( cin >> t )
        {
            return;
        }
        
        cout << strReprompt << endl;
        
        // clear error condition and flush input buffer
        cin.clear();
        cin.ignore(INT_MAX, '\n');
    } while ( true );
}
     
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  3. jiminaus, Sep 20, 2011

    jiminaus macrumors 65816

    jiminaus

    Joined:
    Dec 16, 2010
    Location:
    Sydney
    #3
    You'll get nothing from the challenge if you just ask someone for the answer.
     
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  4. chown33, Sep 20, 2011

    chown33 macrumors 604

    Joined:
    Aug 9, 2009
    Location:
    Brobdingnag
    #4
    This is the same "challenge" as your other thread:
    http://forums.macrumors.com/showthread.php?t=1231451

    The posted code is the same, too, with one difference: the code posted in this thread calculates an average value.

    Other than calculating and printing the average, there are no significant differences. The code here even has the same bugs as the code first posted.

    Posting the same code multiple times doesn't change the code or fix any bugs in it. Posting the same problem multiple times doesn't give you an answer any sooner.

    If you have no idea how to solve the problem, then think about how to read in a single word, and what type of variable you'd need for that. Then think about how you'd convert a word already read into a number. If you don't know what any of that means, talk to your instructor.
     
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