Re: [Dev-C++] floating point numbers

[Martin D. <nex...@qu...>]

P.Lane wrote:

>Hello, I am new to programming and to c++ and Dev-CPP. I have been
>experimenting with numbers and can't figure this one out. Here is the
>code the I am using:
>
>#include<iostream>
>using namespace std;
>int main ()
>{
>    int a;
>    float b;
>    double c;
>    long double d;
>    cout << " Enter a number:  ";
>    cin >> d;
>    c=d;
>    b=d;
>    a=d;
>    cout << d << endl << c << endl << b << endl << a << endl;
>    return 0;
>}
>Here is the result with the number 123456789.123456789:
>1.23457e+008
>1.23457e+008
>1.23457e+008
>123456789
>Now from what I have read, a long double should be good up to 19
>digits, a long up to 15, and a float up to 7. Why does the long double
>return 1.23457e+008, instead of the entered value of
>123456789.123456789, which is only 18 digits long?
>  
>
That output is right. Standard setting for floating point values bigger 
than 10^6 is scientific notation with first 6 digits. Try tampering with 
output formating mathods of std::ostream.

Happy coding,
next_ghost