Question

In my code i have following line.

double temp=(c12*fileSize);

• Here c12 is double and fileSizeis double
• c12 have a value 1700 and
• fileSize have a value 1944038

but after multiplication i am getting -990102696.

Can any one help me on it? Is that some size limits went wrong?

Answer 1

Your c12 and fileSize are most likely ints (+1 Tomasz). Java multiplies the ints, which overflows, becoming negative, and then stores that negative value in your double. Cast c12 and fileSize to double before multiplying:

double c12 = 1700, fileSize = 1944038;
System.out.println(c12 * fileSize);

produces:

3.3048646E9