Chapter 12: Problem 10

What arguments do you pass to a file stream object’s write member function?

Short Answer

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Answer: The write member function of a file stream object requires two arguments: a pointer to the data block to be written ('const char* buffer') and the size of the data block in bytes ('streamsize size'). The 'buffer' argument is a constant pointer to the array of characters that needs to be written to the file, and 'size' specifies the number of bytes (characters) of the data block that should be written.

Step by step solution

Understand the file stream object's write function

The write member function of a file stream object is responsible for writing a block of data (usually in the form of characters) to a file. It requires two main arguments: a pointer to the data block that needs to be written, and the size of the data block in bytes.

Syntax of file stream's write function

The syntax of the file stream object's write member function is as follows: ``` ostream& write(const char* buffer, streamsize size); ``` Here, `ostream` is the stream class (like `ofstream` for output file stream), and the function takes two arguments: 1. `buffer`: a constant pointer to the data block (array of characters) which needs to be written to the file. 2. `size`: the number of bytes (characters) of the data block that should be written.

Using file stream's write function

To use the write member function, you first need to open a file for writing using an `ofstream` object, and then pass the required arguments to the `write` function. Here's an example: ```cpp #include #include int main() { // Create an ofstream object for writing to a file std::ofstream outFile("example.txt"); // Check if the file is open if (outFile.is_open()) { // Define the data block (array of characters) to be written const char* data = "Hello, World!"; // Write the data block to the file outFile.write(data, strlen(data)); // Close the file outFile.close(); } else { std::cout << "Unable to open the file" << std::endl; } return 0; } ``` In this example, we pass the arguments `data` (a pointer to the character array "Hello, World!") and `strlen(data)` (number of characters in the array) to the `write` function. This will write the character array (excluding the null terminator) into the "example.txt" file.

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What arguments do you pass to a file stream object’s write member function?

Short Answer

Step by step solution

Understand the file stream object's write function

Syntax of file stream's write function

Using file stream's write function

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