calculation of Distance using d=u*t+(a*t*t)/2 and providin user flexibility to hav itz own value for u,a,t

import java.io.DataInputStream;
class Distance
{
public static void main(String arg[])
{
float u=0.0f,a=0.0f;
int t=0;
float distance=0.0f;
int ch=0;
do
{
try
{
DataInputStream in = new DataInputStream(System.in);
System.out.println("enter the value of u,a,t ?");
u=Float.valueOf(in.readLine()).floatValue();
a=Float.valueOf(in.readLine()).floatValue();
t=Integer.parseInt(in.readLine());
}
catch(Exception e) {}
distance=u*t+(a*t*t)/2;
System.out.println("distance = " + distance);
System.out.println("1-execute");
System.out.println("2-terminate");
try
{
DataInputStream in = new DataInputStream(System.in);
ch=Integer.parseInt(in.readLine());
}
catch(Exception e) {}
}
while(ch==1);
}
}