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

C++ ios::Showpos() Function

The C++ std::ios::showpos() function is a manipulator that forces the output stream to display a plus sign (+) before positive numbers. It is used to improve the readability of numerical outputs, especially when differentiating positive values form negative ones.

For example, std::cout << std::showpos << 112; then the output will be +112.

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

ios_base& showpos (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 showpos() function.

#include <iostream>
int main()
{
    int x = 121;
    std::cout << std::showpos;
    std::cout << "Result :  " << x << std::endl;
    return 0;
}

Output of the above code is as follows −

Result :  +121

Consider the following example, where we are going to use the showpos() function with the negative and positive numbers.

#include <iostream>
int main()
{
    int x = 11;
    int y = -11;
    std::cout << std::showpos;
    std::cout << "Result : " << x << std::endl;
    std::cout << "Result : " << y << std::endl;
    return 0;
}

Following is the output of the above code −

Result : +11
Result : -11

In the following example, we are going to use the showpos() function with floating points.

#include <iostream>
int main()
{
    double x = 11.23;
    std::cout << std::showpos;
    std::cout << "Result : " << x << std::endl;
    return 0;
}

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

Result : +11.23

ios.htm

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