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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_showpoint.htm below:

C++ ios::Showpoint() Function

The C++ std::ios::showpoint() function is a stream manipulator that ensures floating point numbers are displayed with a decimal point, even if they are whole numbers. When this function is invoked on a output stream, it modifies the stream format flags to include showpoint flags.

The showpoint() function can be used with the insertion operator (<<) for integration into stream operations.

Following is the syntax for std::ios::showpoint() function.

ios_base& showpoint( std::ios_base& str );

• str − It indicates the stream object whose format flag is affected.

This function returns the Argument str.

If an exception is thrown, str is in a valid state.

It modifies str. Concurrent access to the same stream object may cause data races.

In the following example, we are going to consider the basic usage of the showpoint() function.

#include <iostream>
#include <iomanip>
int main()
{
    double x = 112.0;
    std::cout << std::showpoint << x << std::endl;
    return 0;
}

Output of the above code is as follows −

112.000

Consider the following example, where we are going to use the std::fixed along with thw showpoint() function.

#include <iostream>
#include <iomanip>
int main()
{
    double x = 12.3;
    std::cout << std::fixed << std::showpoint << x << std::endl;
    return 0;
}

Following is the output of the above code −

12.300000

In the following example, we are going to observe the output without showpoint() function.

#include <iostream>
int main()
{
    double x = 112.0;
    std::cout << x << std::endl;
    return 0;
}

If we run the above code it will generate the following output −

112

ios.htm

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