Multiplying long values?

Question

class Main {  
   public static void main (String[] args){  
     long value = 1024 * 1024 * 1024 * 80;  
     System.out.println(Long.MAX_VALUE);  
     System.out.         


        

Answer 1

The integer literals are ints. The ints overflow. Use the L suffix.

long value = 1024L * 1024L * 1024L * 80L;

If the data came from variables either cast or assign to longs beforehand.

long value = (long)a * (long)b;

long aL = a;
long bL = b;
long value = aL*bL

Strictly speaking you can get away with less suffices, but it's probably better to be clear.

Also not the lowercase l as a suffix can be confused as a 1.