math with decimals

This is a discussion on math with decimals within the C++ Programming forums, part of the General Programming Boards category; why doen't my program multiple the decimal numbers #include <iostream.h> #include <string.h> #include <math.h> int main () { int amount; ...

  1. #1
    Registered User wayko's Avatar
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    Talking math with decimals

    why doen't my program multiple the decimal numbers

    #include <iostream.h>
    #include <string.h>
    #include <math.h>
    int main ()
    {
    int amount;
    int price;
    int total;
    cout << "Enter the current amount:";
    cin >> amount;
    cout << "Enter price : ";
    cin >> price;
    total = (amount * price);
    cout << "The total amount is : "<< total;

    return 0;
    }

    like 10 * 2.5 should = 25 but i get 20
    hello its me Wayko

  2. #2
    Mayor of Awesometown Govtcheez's Avatar
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    Because you have all of your variables declared as integers; declare them as doubles instead.

  3. #3
    Registered User wayko's Avatar
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    thanx it works
    is there a way to send the results to a txt file or database file?
    hello its me Wayko

  4. #4
    Registered User
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    #include <fstream>
    //other include files
    //
    //


    using namespace std;

    int main()
    {
    //your own stuff
    //
    //
    ofstream fout;
    fout.open("testfile.txt");
    fout << myvar1 << myvar2; //etc..
    fout.close();
    }

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