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Possible loss of precision

kavitha ms
Greenhorn

Joined: Oct 21, 2008
Posts: 1
import java.awt.*;
import java.util.*;
import java.applet.*;
import java.lang.*;

public class m1 extends Applet
{
public void paint (Graphics g)
{
float Dx=0,Dy=0,Dz=0, Vxy=0,Vz=0,Vx=0,Vy=0,Axy=0,Az=0;
double heading=75, climb=30;
float TAccn=15,TSpeed=10,t=5;

int n=1,i;

double[] X = new double[5];
double[] Y = new double[5];
double[] Z = new double[5];

//Acceleration with climb motion

Axy = TAccn * ((float) Math.cos(climb));

Az = TAccn * ((float) Math.sin(climb));

Vxy = TSpeed * ((float) Math.cos(climb));

Vz = TSpeed * ((float) Math.sin(climb));

Vx = Vxy * ((float) Math.sin(heading));

Vy = Vxy * ((float) Math.cos(heading));

float sin_heading = (float) Math.sin(heading);

float t1 = t * t;

Dx = 0.5 * Axy * t1 * sin_heading;

Dy = 0.5 * Axy * t1 * ((float) Math.cos(heading));

Dz = 0.5 * Az * t1;

for(i=0;i<n;i++)
{

X[i] = X[i] + Vx * t + Dx;

Y[i] = Y[i] + Vy * t + Dy;

Z[i] = Z[i] + Vz * t + Dz;

int x1 = (int) X[i];
int y1 = (int) Y[i];

g.drawLine(0,0,x1,y1);
}
}

}



this is the program i hav written

but its giving error like
possible loss of precision for the lines

Dx = 0.5 * Axy * t1 * sin_heading;

Dy = 0.5 * Axy * t1 * ((float) Math.cos(heading));

Dz = 0.5 * Az * t1;
Vijitha Kumara
Bartender

Joined: Mar 24, 2008
Posts: 3817


0.5 * Axy * t1 * sin_heading;


The problem is you are multiplying the float variable with 0.5 (which is double by default). Try using 0.5f if you want to do it the same way you are doing.
[ October 22, 2008: Message edited by: Vijitha Kumara ]

SCJP 5 | SCWCD 5
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Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38075
    
  22
And you would appear to have missed the naming policy when you logged on, "Kavitha Ms". We require first name-space-last name not abbreviation. Please go to "my profile" "update profile" and correct your displayed name to comply.

CR
Martijn Verburg
author
Bartender

Joined: Jun 24, 2003
Posts: 3274
    
    5

Also please do UseCodeTags, it makes it easier for us to help you . Now onto your question, did you manage to resolve your problem?


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