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This is a discussion on Need Help within the C++ Programming forums, part of the General Programming Boards category; I have to write code for class that sums numbers up to a certain point like 5 billion using an ...

  1. #1
    Registered User
    Join Date
    Aug 2010
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    4

    Need Help

    I have to write code for class that sums numbers up to a certain point like 5 billion using an increment that we put in using cin, so if we start at 0 and go to 5 billion by increments of 2 it would be like 0+2=2 2+2=4 and so on. When i cout my sums they always read zero can anyone help

    Code:
     
    #include <iostream>
    #include <iomanip>
    using namespace std;
    int main ()
    {
    
    /* Declared Integers*/
    double dsum, dx, da, i, ep, ci, pl;
    
    
    
    /*Assign Variables*/
    
    cout << "What is your starting point using a decimal"<< endl;
    cin >> dx;
    cout << "What is your ending point using a decimal"<< endl;
    cin >> ep;
    cout << "What is your counting increment using a decimal"<< endl;
    cin >> ci;
    cout << "How many times should a sum be printed" << endl;
    cin >> pl;
    
    dsum = 0.0;
    da = 1.0;
    
    /* Prints Columns */
    cout << "Line" << "\t" << "Every "<< pl<< "th" << "\t" << "Sum" << "\n" << endl;
    /*Sums the Numbers*/
    while (da<=pl)
    {
    
    i = 1.0;
    
    while (i <= ep/pl)
    {
    
    dsum = dsum + dx;
    i++;
    dx+ci;
    }
    /* prints out the numbers*/
    cout << setprecision(20)<< da << "\t" << (ep/pl)*da << "\t" << dsum << "\n" << endl;
    da++;
    }
    system ("pause");
    return 0;
    }

  2. #2
    Registered User
    Join Date
    May 2010
    Posts
    6
    (Like 5 billion or is it 5 billion)?????????

  3. #3
    msh
    msh is offline
    Novice
    Join Date
    Jul 2009
    Posts
    568
    Ignoring everything else, this is why your dsum will always be zero, if your dx is zero.
    Quote Originally Posted by Kess0990 View Post
    Code:
    while (i <= ep/pl)
    {
    
    dsum = dsum + dx;
    i++;
    dx+ci; // Result of this expression is not assign to anything.
    }

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