read-file-line-by-line.cpp

#include <string>
#include <fstream>

int main() {
	
	std::ifstream input_file("/etc/passwd");
	
	if (input_file)
	{
	    std::string line;
	    while(std::getline(input_file, line))
	    {
	        // do something with @line
	    }
	}
	
	return 0;
}