Thread: Suffix use

Hello everybody,
I want to ask: when do i really need to use Suffix for numbers.
I will give an example:

let say I write:

[code]
long long c;
[code/]

the variable c is of long long type. When I want to initiate its value,
shoule I write:
[code]
c = 12;
[code/]

when I write it like this, the compiler recognizes that c is a long long type and if I do:
[code]
printf("%d",sizeof(c));
[code/]

I get the result of 8...which is of course 64 bit. so the compiler actually remembers that c is long long type.

but I saw some cases (especially in java) that I actually need to force it to be long long by means of c = 12LL, like this next example:

[code]
c = 12LL;
[code/]


now..I am sure some of you think: why wouldn't I just use a normal int for that purpose, but I have a specific reason that I need to use long long variables.
Thx.

You declared the variable c as being a long long, so c is a long long int. The type of c is not dependent on its value. Rather, the range of possible values for c is dependent on the type of c.

For an integer constant (also called an integer literal), on the other hand, the type is determined by its value (which may be determined by its prefix, if any) and suffix, if any. 12 has no prefix, so it is a decimal constant. It also has no suffix, so it has a type of int since 12 is guaranteed to be in the range of int. 12LL has no prefix, so it is also a decimal constant. It has a suffix of LL, so it has a type of long long int.

You could safely assign 12 to c because an int can be safely converted to a long long int.

Originally Posted by patishi

Thx for the reply. so if that so, why do I see sometimes people do: long long board[2];
n[0] = 0LL;
n[1] = 0LL;

what is the purpose of that ?

Perhaps they want to be consistent in type and for some reason decided to use assignment instead of initialisation. Nonetheless, in the example you gave, it would be sufficient to write:

Code:

long long board[2] = {0};