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My english is not good,so i don't know how to say,is it use "withhold"?i mean
a=12.33342,b=1.3321
if i want to withhold the 2 two digits of the decimal fraction
i wanna output a=12.33,b=1.33
so is there any function in cout can control it?just like cout.precision(),which can control the decimal fraction's valid digits?

use ios::precision(int)
or read about streams in help ...

Best regards
DM

if i use the procision(3) function
a=12.33342,b=1.3321
the output will be
12.3 1.33
but what i need is
12.333 1.332

which function i shall use?

In C:
[c]printf ("%.3lf\n", 1.3456789);[/c]
where the .3 signifies the number of digits after the decimal point.

In C++:
[cpp]std::cout << std::fixed << std::setprecision(3) << 1.3456789 << endl;[/cpp]

[cpp] cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2); [/cpp]

Thanks so much