Re: [avr-gcc-list] update on the last issue

[E. Weddington]

intiha Ho gai wrote:

> Hi,
> I did a little bit more of search and figured that if i use the long
> long for my X, Y coordinates and the sums, I should be able to handle
> extremely large numbers. But now When i do that, it still give me
> incorrect results. Even when i try to assign them those high values
> directly, it fails!!!!
>
> Here is my code. 
>
> table.sumX = 12338578;
>         table.sumY = -3336078;
>         table.sumXSquared = 7260107358192; <-- 252
>         table.sumXY = -1646741910392; <--- 253
>      	 
<snip>

> This is the compile warning!
> Cricket.c:252: warning: integer constant is too large for "long" type
> Cricket.c:253: warning: integer constant is too large for "long" type
> Cricket.c:259: warning: long int format, different type arg (arg 3)
> <-- Why these warnings?
> Cricket.c:259: warning: long int format, different type arg (arg 4)
> <--It prints something wrong as well :(
>
> where i have defined table as of type regTable (i know long long and
> int64_t are the same but i am clutching at straws)
>
> typedef struct regressTbl{
>         int16_t n ;
>         long long sumXY;
>         int64_t sumX,sumY;
>         long long sumXSquared;
> }regTable;
>
> Any ideas?
>
>  
Integer constants in C are of type *int* unless specified otherwise. You 
can use suffixes on the constants to tell the compiler what type (size) 
the numbers are, such as:
12345678UL
The UL on the end means Unsigned Long.

IIRC, you can use ULL to specify an unsigned long long.

HTH
Eric