Line by Line or All at Once? Which is the Most Efficient Way to Read a File in C ?

Reading File Contents Efficiently: Line by Line or Entirely

Problem:

While learning about file operations, you may encounter scenarios where reading a text file efficiently is crucial. You've mastered reading words individually but seek guidance on reading line by line or retrieving the entire file contents in one go.

Solution:

To read a file line by line, utilize the std::getline function:

#include <fstream>
#include <string>

int main() {
    std::ifstream file("Read.txt");
    std::string str;
    
    while (std::getline(file, str)) {
        // Process line
    }
}

Alternatively, if you prefer to read the entire file at once, you can concatenate the lines you retrieve:

std::ifstream file("Read.txt");
std::string str;
std::string file_contents;
    
while (std::getline(file, str)) {
    file_contents += str;
    file_contents.push_back('\n');
}  

Enhanced File Stream Usage:

Instead of manually opening and closing the file, you can construct the file stream with the file name within its constructor:

std::ifstream file("Read.txt");

The above is the detailed content of Line by Line or All at Once? Which is the Most Efficient Way to Read a File in C ?. For more information, please follow other related articles on the PHP Chinese website!