| re: what 's the precision of 'double'?
blackswift wrote:
[color=blue]
> hello,
>
> program:
> double x;
> scanf("%lf", &x);
> printf("%lf\n", x);[/color]
Leave out the l prefix on printf.
[color=blue]
> input:
> 3.14159265358979
>
> output:
> 3.141593 (GCC 4.0.1 & visual c++ 6.0)[/color]
printf rounded the output to 6 digits, since you didn't specify anything
else. This has nothing to do with the precision of double.
[color=blue]
> it seems that double has the same precision as float.[/color]
They might or might not have the same precision. The C++ standard only
defines minimum requirements for those types.
| 
