Isprint() in C++

The C++ isprint() function is used to determine if a given character is a printable character. A printable character is any character that is not a control character (such as newline, tab, or carriage return) and can be displayed or printed to the screen.

Here’s how you can use the isprint() function in C++:

#include <iostream>
#include <cctype> // Include the <cctype> header for isprint() function

int main() {
    char ch = 'A';

    if (isprint(ch)) {
        std::cout << ch << " is a printable character." << std::endl;
    } else {
        std::cout << ch << " is not a printable character." << std::endl;
    }

    ch = '\n';

    if (isprint(ch)) {
        std::cout << ch << " is a printable character." << std::endl;
    } else {
        std::cout << ch << " is not a printable character." << std::endl;
    }

    return 0;
}

In this example, we include the <cctype> header to access the isprint() function. We then use it to check if a character is printable. The isprint() function returns a non-zero value (typically 1) if the character is printable, and 0 if it’s not.

In the example, we check if the characters ‘A’ and ‘\n’ (newline) are printable. The output will be:

A is a printable character.
[Newline] is not a printable character.

As you can see, ‘A’ is a printable character, while the newline character ‘\n’ is not.