To get precision of n digits in decimal value.

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First of all use the header #include<iomanip>

Write cout<<fixed;   ///// to get the same precision of zeros also in decimal points.

Then cout<<setprecision(n);   ----(A)

         cout<<variable;   //variable which you want with n decimal precision points.

Note: the value n should be in the decimal ranging of datatype. You can also use type casting to get more decimal point values.

Now all the values printed after the above statement A  will have the same precision.

In order to disable the precision use the statement cout.unsetf (ios::fixed);

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