Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

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

C++ ios::Boolalpha() Function

The C++ std::ios::boolalpha function is used to control the formatting of the boolean output in streams. When this function is invoked, boolean values are displayed as textual true or false instead of default 1 or 0. It is triggered by using the std::boolalpha manipulator and disabled with std::noboolalpha.

This function improves the readability of boolean output in logs and user interfaces.

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

ios_base& boolalpha (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 boolalpha() function.

#include <iostream>
int main()
{
    bool x = true;
    std::cout << "Without boolalpha: " << x << std::endl;
    std::cout << std::boolalpha;
    std::cout << "With boolalpha: " << x << std::endl;
    return 0;
}

Output of the above code is as follows −

Without boolalpha: 1
With boolalpha: true

Consider the following example, where we are going to use the boolalpha with std::cin to read a boolean value from the user.

#include <iostream>
int main()
{
    bool x;
    std::cout << "Enter true or false : ";
    std::cin >> std::boolalpha >> x;
    std::cout << "Entered Input : " << x << std::endl;
    return 0;
}

Following is the output of the above code −

Enter true or false : true
Entered Input : 1

Let's look at the following example, where we are going to determine if a given number is even or odd.

#include <iostream>
int main()
{
    bool x = false;
    int a = 1;
    if (a % 2 == 0) {
        x = true;
    }
    std::cout << std::boolalpha;
    std::cout << "Is the given number even? " << x << std::endl;
    return 0;
}

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

Is the given number even? false

ios.htm

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4