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C++ istream::gcount() function

The C++ std::istream::gcount() function is used to return the number of chracters extracted by the last unformatted input operation performed on the stream. It is used after functions like read() to determine how many characters were actually read.

The gcount() function does not modify the streams state and returns a value of type std::streamsize

Following is the syntax for std::istream::gcount() function.

streamsize gcount() const;

It does not accept any parameters.

This function returns the number of characters extracted by the last unformatted input operation performed on the object.

If an exception is thrown, there are no changes in the stream.

Accesses the stream object.

Let's look at the following example, where we are going to read the characters.

#include <iostream>
int main()
{
    std::cout << "Enter Characters: ";
    char x[5];
    std::cin.get(x, 4);
    std::cout << "Characters read: " << std::cin.gcount() << std::endl;
    std::cout << "Buffer Contents: " << x << std::endl;
    return 0;
}

Output of the above code is as follows −

Enter Characters: abcdefgh
Characters read: 3
Buffer Contents: abc

Consider the following example, where we are going to read the integers as string.

#include <iostream>
int main()
{
    std::cout << "Enter an Integer: ";
    char buffer[5];
    std::cin.getline(buffer, 3);
    std::cout << "Characters read: " << std::cin.gcount() << std::endl;
    std::cout << "Buffer Contents: " << buffer << std::endl;
    return 0;
}

Following is the output of the above code −

Enter an Integer: 123421
Characters read: 2
Buffer Contents: 12

istream.htm

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