setprecision c++ | How to Use setprecision in c++

Set decimal precision. Sets the decimal precision to be used by output operations. Behaves as if a call to the stream's member ios_base::precision with n. In C++, you can use the 'precision' function to set the precision of the output. The function 'precision' is present in the header file 'iostream.h'. This describes the C++ Standard Template Library (STL) setprecision function for output stream manipulation.

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function (setprecision c++ | How to Use setprecision in c++)

If you are new in C++ , and want to output point number up to 2 digits in C++. For example, if number is 3.444, then the output should be 3.44 or if number is 88999.4234 then output should be 88999.42, How can i do that. Here is my code. setprecision c++ | How to Use setprecision in c++

setprecision c++, How to Use setprecision in c++
setprecision c++, How to Use setprecision in c++
#include <iomanip.h>
#include <iomanip>
int main()
{
    double num1 = 3.12345678;
    cout << fixed << showpoint;
    cout << setprecision(2);
    cout << num1 << endl;
}

std::setprecision

/*unspecified*/ setprecision (int n);

Set decimal precision
Sets the decimal precision to be used to format floating-point values on output operations.Behaves as if member precision were called with n as argument on the stream on which it is inserted/extracted as a manipulator (it can be inserted/extracted on input streams or output streams).This manipulator is declared in header <iomanip>.

 

Parameters (setprecision c++ | How to Use setprecision in c++)

n
New value for the decimal precision.

 

Return Value

Unspecified. This function should only be used as a stream manipulator (see example).

 

Example for setprecision c++ | How to Use setprecision in c++

setprecision c++, How to Use setprecision in c++
setprecision c++, How to Use setprecision in c++
// setprecision example
#include <iostream>     // std::cout, std::fixed
#include <iomanip>      // std::setprecision

int main () {
  double f =3.14159;
  std::cout << std::setprecision(5) << f << '\n';
  std::cout << std::setprecision(9) << f << '\n';
  std::cout << std::fixed;
  std::cout << std::setprecision(5) << f << '\n';
  std::cout << std::setprecision(9) << f << '\n';
  return 0;
}
Output:

3.1416 3.14159 3.14159 3.141590000

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