In my code i have following line. <pre class="prettyprint"><code>double temp=(c12*fileSize); </code></pre> <ul> <li>Here c12 is double and fileSizeis double </li> <li>c12 have a value 1700 and </li> <li>fileSize have a value 1944038</li> </ul> but after multiplication i am getting <code>-990102696</code>. Can any one help me on it? Is that some size limits went wrong?

<code>(int)1700 * (int)1944038</code> is equal to your <code>-990102696</code>. Are you sure <code>c12</code> and <code>fileSize</code> aren't integers? If they are, the multiplication occurs with integer types, integer overflow and it is being promoted to <code>double</code> afterwards.

Double value negative after multiplication -Java

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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?

993

asked May 12 '11 16:05

user750932

1 Answers

(int)1700 * (int)1944038 is equal to your -990102696.

Are you sure c12 and fileSize aren't integers? If they are, the multiplication occurs with integer types, integer overflow and it is being promoted to double afterwards.