File output using ofstream in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the header needed for file output.

C++

#include [1]

int main() {
    return 0;
}

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A<vector>

B<iostream>

C<fstream>

D<string>

Attempts:

3 left

💡 Hint

Common Mistakes

Including instead of

Forgetting to include any header for file output

The header is required to use ofstream for file output.

2fill in blank

medium

Complete the code to create an ofstream object named 'file' that opens 'output.txt'.

C++

std::[1] file("output.txt");

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Aifstream

Bofstream

Cfstream

Diostream

Attempts:

3 left

💡 Hint

Common Mistakes

Using ifstream instead of ofstream

Using fstream without specifying mode

ofstream is used to write to files.

3fill in blank

hard

Fix the error in the code to write 'Hello, file!' to the file.

C++

std::ofstream file("output.txt");
file [1] "Hello, file!";
file.close();

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A<<

B==

C=

D>>

Attempts:

3 left

💡 Hint

Common Mistakes

Using >> instead of <<

Using = to assign instead of writing

The insertion operator << is used to write data to the file stream.

4fill in blank

hard

Fill both blanks to check if the file was opened successfully and print a message.

C++

std::ofstream file("output.txt");
if (file.[1]()) {
    std::cout << "File opened successfully." << std::endl;
} else {
    std::cout << "Failed to open file." << std::endl;
}

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Aclose

Bopen

Cfail

Dis_open

Attempts:

3 left

💡 Hint

Common Mistakes

Using open() instead of is_open() in the if condition

Using fail() incorrectly

The is_open() function checks if the file stream is open.

5fill in blank

hard

Fill all three blanks to write multiple lines to a file using a loop.

C++

std::ofstream file("output.txt");
for (int [1] = 1; i <= 3; [2]) {
    file [3] "Line " << i << std::endl;
}
file.close();

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Ai

B++i

C<<

D--i

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable name in loop

Using --i which decrements instead of increments

Using >> instead of << to write

Use 'i' as the loop variable, increment it with ++i, and write to file using << operator.