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.

Syntax

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

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

Parameters

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

Return Value

This function returns the Argument str.

Exceptions

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

Data races

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

Example

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

Output of the above code is as follows −

112.000

Example

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;
}

Output

Following is the output of the above code −

12.300000

Example

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;
}

Output

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

112