DOUBLE to LONG INT conversion

[davidchardonnet]

Hello,

I have a problem with Visual C++ compiler. The problem is in data conversion between LONG INT and DOUBLE. And the same occurs with INT and DOUBLE. Does anybody know how I can make it work? Here is the sample code:
-----------------------------------------------------------
double time_double_miliseconds;
double time_double_seconds;
long time_long_seconds;

...
// Here time_double_miliseconds contains 14.400000

time_double_seconds=(1000.0 * time_double_miliseconds);

// Here time_double_seconds contains 14400.00000

time_long_seconds = time_double_seconds;

// Here time_long_seconds contains 14399 !!!!!
-----------------------------------------------------------

What I want is to get 14400 into time_long_seconds. And I don't know why the compiler does this.

Thank you for your answers

David CHARDONNET

 

[rpet]

I tried to reproduce this using VC++ 6 SP5, but the result is 14400.


int main()
{
double time_double_miliseconds = 14.400000;
double time_double_seconds = 0.;
long time_long_seconds = 0L;

// Here time_double_miliseconds contains 14.400000
time_double_seconds =(1000.0 * time_double_miliseconds);

// Here time_double_seconds contains 14400.00000
time_long_seconds = time_double_seconds;

// prints 14400
std::cout << time_long_seconds << std::endl;
return 0;
}


Are you sure, the problem is not somewhere else in your code?

-- ralf

 

[Cagliostro]

use static_cast
time_long_seconds = static_cast<long>(time_double_seconds); John Fill

ivfmd@mail.md