hasing question- warning possible loss of data

[adams161]

hi,

when i hash i use _64bit numbers. the size of my tables, hashmax is measured in long. so if i have an int64 key and a long hashmax and do hashkey=key%hashmax i get a possible loss of data warning. hashkey is long too. but since key an int 64 number is being divided by hashmax to produce a long number i always discounted the warning.

am i correct?

Mike

[Dann Corbit]

hi,

when i hash i use _64bit numbers. the size of my tables, hashmax is measured in long. so if i have an int64 key and a long hashmax and do hashkey=key%hashmax i get a possible loss of data warning. hashkey is long too. but since key an int 64 number is being divided by hashmax to produce a long number i always discounted the warning.

am i correct?

Mike

The remainder after modulus is less than hashmax in size (by definition of modulus). So if hashmax is equal to or smaller than LONG_MAX as defined in <limits.h> with c (or <limits> with C++) then you should be OK.
Probably, if you explicitly cast the assignment, the warning will vanish.