setprecision in c++
The setprecision
function in C++ is used to control the precision of floating-point values when they are displayed. It is part of the <iomanip>
library, which provides input/output manipulators for C++.
Here are the steps to use setprecision
in C++:
- Include the
<iomanip>
library at the beginning of your code:
cpp
#include <iomanip>
- Declare the
std
namespace to avoid having to writestd::
before eachsetprecision
call:
cpp
using namespace std;
Alternatively, you can use the std::
prefix before each setprecision
call without declaring the namespace.
- Use the
setprecision
function to set the desired precision for floating-point values. The function takes an integer argument representing the number of digits after the decimal point to display:
cpp
cout << setprecision(2);
In this example, the precision is set to 2, which means that floating-point values will be displayed with two digits after the decimal point.
- Display the floating-point value using
cout
:
cpp
double value = 3.14159;
cout << value;
The value will be displayed with the specified precision: 3.14.
It's important to note that setprecision
only affects the output of floating-point values and not their actual internal representation or calculation. It is mainly used for formatting purposes when displaying the values to the user.
That's it! By following these steps, you can use setprecision
in C++ to control the precision of floating-point values when they are displayed. Let me know if you have any further questions.