io:precision

C++ Reference

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precision

Syntax:

    #include <fstream>
    streamsize precision();
    streamsize precision( streamsize p );

The precision() function either sets or returns the current number of digits that is displayed for floating-point variables. For example, the following code sets the precision of the cout stream to 5:

     float num = 314.15926535;
     cout.precision( 5 );
     cout << num;

This code displays the following output:

     314.16