what is wrong with Math.ceil

[wheresjim]

I think I am going crazy. I have used Math.ceil many times to round up
a number, and for some reason I cannot make it work properly today.
The following code:

public class MathTest
{
public static void main(String args[])
{
System.out.println(Math.ceil(40/15));
}
}

Produces this output:

2.0

Should it not take the result (2.6666666666666666666666666666667
according to my Microsoft calculator) and round it up to 3?

 

[Carl Howells]

I think I am going crazy. I have used Math.ceil many times to round up
a number, and for some reason I cannot make it work properly today.
The following code:

public class MathTest
{
public static void main(String args[])
{
System.out.println(Math.ceil(40/15));
}
}

Produces this output:

2.0

Should it not take the result (2.6666666666666666666666666666667
according to my Microsoft calculator) and round it up to 3?

You sure that's the result? Try this code?

public class MathTest
{
public static void main(String [] args)
{
System.out.println(40/15);
}
}

You might feel kind of silly after running that code...

 

[Ann]

I think I am going crazy. I have used Math.ceil many times to round up
a number, and for some reason I cannot make it work properly today.
The following code:

public class MathTest
{
public static void main(String args[])
{
System.out.println(Math.ceil(40/15));
}
}

Produces this output:

2.0

Should it not take the result (2.6666666666666666666666666666667
according to my Microsoft calculator) and round it up to 3?

First thing is 40/15 -> 2
Then ceil(2) = 2.0

 

[The Abrasive Sponge]

I think I am going crazy. I have used Math.ceil many times to round up
a number, and for some reason I cannot make it work properly today.
The following code:

public class MathTest
{
public static void main(String args[])
{
System.out.println(Math.ceil(40/15));
}
}

Produces this output:

2.0

Should it not take the result (2.6666666666666666666666666666667
according to my Microsoft calculator) and round it up to 3?

A division of integer renders an integer so
40/15 = 2



and the ceil of 2 is 2.