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

C++ ios::Showbase() Function

The C++ std::ios::showbase() function is a stream manipulator that enables the display of numerical base prefixes when outputting integer values. When this function is activated, it ensures that hexadecimal numbers are prefixed with 0x, octal numbers with 0, and decimal numbers are unaffected.

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

ios_base& showbase( 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.

Let's look at the following example, where we are going to use the showbase() function with decimal.

#include <iostream>
#include <iomanip>
int main()
{
    int x = 112;
    std::cout << "Decimal default : " << x << std::endl;
    std::cout << std::showbase;
    std::cout << "Decimal With showbase : " << x << std::endl;
    return 0;
}

Output of the above code is as follows −

Decimal default : 112
Decimal With showbase : 112

Consider the following example, where we are going to use the showbase() function with hexadecimal.

#include <iostream>
#include <iomanip>
int main()
{
    int x = 234;
    std::cout << std::hex;
    std::cout << "Hexadecimal default : " << x << std::endl;
    std::cout << std::showbase;
    std::cout << "Hexadecimal With showbase : " << x << std::endl;
    return 0;
}

Following is the output of the above code −

Hexadecimal default : ea
Hexadecimal With showbase : 0xea

In the following example, we are going to use the showbase() function with the octal.

#include <iostream>
#include <iomanip>
int main()
{
    int x = 1123;
    std::cout << std::oct;
    std::cout << "Octal default : " << x << std::endl;
    std::cout << std::showbase;
    std::cout << "Octal With showbase : " << x << std::endl;
    return 0;
}

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

Octal default : 2143
Octal With showbase : 02143

ios.htm

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