ios manipulators showpoint() function in C++

The showpoint() method of stream manipulators in C++ is used to set the showpoint format flag for the specified str stream. This flag always displays the floating point values along with their decimal values.

Syntax:

ios_base& showpoint (ios_base& str)

Parameters: This method accepts str as a parameter which is the stream for which the format flag is affected.

Return Value: This method returns the stream str with showpoint format flag set.

Example 1:

// C++ code to demonstrate
// the working of showpoint() function

#include <iostream>

using namespace std;

int main()
{

    // Initializing the floating values
    double n1 = 10;
    double n2 = 20.0;

    cout.precision(5);

    // Using showpoint()
    cout << "showpoint flag: "
         << showpoint
         << n1 << endl
         << n2 << endl;

    return 0;
}

Output:

showpoint flag: 10.000
20.000

Example 2:

// C++ code to demonstrate
// the working of showpoint() function

#include <iostream>

using namespace std;

int main()
{

    // Initializing the floating values
    double n3 = 30.1223;

    cout.precision(5);

    // Using showpoint()
    cout << "showpoint flag: "
         << showpoint
         << n3 << endl;

    return 0;
}

Output:

showpoint flag: 30.122

Reference: http://www.cplusplus.com/reference/ios/showpoint/