long data type overflow 1

[dontyell]

Hi,

I am running into a problem. I was trying to assign the value 128 * 16777216 to a C# long data type. I always got overflow error. I checked the range of the long data type, the overflow shouldn't occur in my case. Anyone has any suggestion?

Thanks,
Cindy

 

[obislavu]

Write

long lv = 128 * (long)16777216 ;

-obislavu-

 

[dontyell]

Thanks for the quick response. Actually I tried this and it works! But why should I do this? Isn't it supposed to implicitly convert to long data type?

 

[obislavu]

When you write long lv = 128 * 16777216 ; the evaluation is made from right to left, that means first multiply 128 by 16777216 as integer numbers and the result is assigned (and converted) to a long. But the result cannot be calculated due to overflow.
-obislavu-