How to Efficiently Access a Specific Line in a Text File Using C ?

Reaching a Specific Line in a Text File in C

In C , retrieving specific lines from a text file can be achieved by traversing through the file. By utilizing loopholes and iterating through the lines, you can efficiently pinpoint the desired location.

To demonstrate this, consider the following code snippet:

<code class="cpp">#include <fstream>
#include <limits>

std::fstream& GotoLine(std::fstream& file, unsigned int num) {
    file.seekg(std::ios::beg);
    for (int i = 0; i < num - 1; ++i) {
        file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
    }
    return file;
}</code>

With this function, you can directly access the beginning of a specific line. For instance:

<code class="cpp">std::fstream file("bla.txt");

GotoLine(file, 8);

string line8;
file >> line8;

std::cout << line8;</code>

Here, the program reads the eighth line from the "bla.txt" file and prints it to the console. This method is particularly useful when working with large text files and allows you to access specific lines without the need to read the entire file.

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