Double returns 1.#INF

This is a discussion on Double returns 1.#INF within the C++ Programming forums, part of the General Programming Boards category; I understand 1.#INF represents infinity and I am sure the issue is simple, but I cannot for the life of ...

  1. #1
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    Double returns 1.#INF

    I understand 1.#INF represents infinity and I am sure the issue is simple, but I cannot for the life of me figure out what is causing it. The issue is when trying to find the average. Everything seems like it is in its place.

    Code:
    /*
    CMPSC 101
    Section 01
    Fall Semester
    2010
    Justin Eckrote
    JAE5086
    */
    #include <iostream>
    #include <string>
    using namespace std;
    int main ()  // Program determines what fruit you want.
    {
           double number, tot, counter, average, range, low, high;
           counter = 0.0;
           tot = 0.0;
           low = 100.0;
           high = 0.0;
           while (!cin.eof())
           {
               cin >> number;
               if ((number >= 0.0) && (number <= 100.0))
               {
                   if (number < low)
                   {
                       low = number;
                   }
                   if (number > high)
                   {
                       high = number;
                   }
                   counter = counter + 1.0;
                   tot = tot + number;
               }
               if ((number < 0.0) && (number > 100.0))
               {
                   cout << "out of range; ignored." << endl;
               }
           }
           if (counter = 1.0) 
           {
               cout << "No data was entered" << endl;
           }
           else 
           {
               average = tot / counter;
               cout << "The average is " << average << endl;
               range = high - low;
               cout << "The range is " << range << endl;
           }       
    }

  2. #2
    and the hat of wrongness Salem's Avatar
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    Examine your if statements for = where you should be using ==
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    Ok, I am pretty sure I ran into that problem before. Hopefully with a little more practice I will remember to use == instead of = inside if statements. Thanks for the help

    One problem down, a new one up. Now that the calculation is not coming up with 1.#INF, I find that the calculation is incorrect. There appears to be no flaw in the math itself, as this is a pretty simple equation. Yet, the numbers are off.

    Example: Input 1, 3, then break the loop with control+z. This returns an average of 3.5 instead of 2.

  4. #4
    a guy with long hair Xupicor's Avatar
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    About forgetting '==' and '=' difference:
    You can try using:
    Code:
    if (25 == variable)
    In other words, put rvalue first, and lvalue later. If you forget one '=' there, then you'll get a compiler error, because you just tried to assign to rvalue.

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