[Solved] Cannot create a txt file using fstream::open

Point 1: You cannot open to read if the file doesn’t exist. Fortunately you probably don’t want to. Simultaneously reading and writing the same file is problematic and almost always a bad idea. Until you know you have to read and write at the same time, open the file for reading read in the file … Read more

[Solved] C++ fstream getline parameters

If you mean std::basic_stream::getline(), you provide a pointer to character array and the size of that array. You have to create the array somewhere by yourself. If some line is longer than sz – 1, only part of it with length sz – 1 will be read. If you don’t know the maximum length of … Read more

[Solved] Reading an input file in C++

doing while (fin >> name >> var1 >> var2 >> var3) { cout << name << var1 << var2 << var3 << endl; } you rewrite all the time on the same variables, you need to put the value in a vector as you say in your question you need also to check if each … Read more

[Solved] c++ open file in one line

You can use the constructor to specify the filename: ifstream inputFile(“data.txt”); See the details for std::basic_ifstream (constructor). explicit basic_ifstream( const char* filename, std::ios_base::openmode mode = ios_base::in ); First, performs the same steps as the default constructor, then associates the stream with a file by calling rdbuf()->open(filename, mode | std::ios_base::in) (see std::basic_filebuf::open for the details on … Read more

[Solved] C++ append to existing file [duplicate]

You can’t. Files don’t really have lines, they just store a bunch of characters/binary data. When you have 1,2,3,4,5 6,7,8,9,0 It only looks that was because there is an invisible character in there that tells it to write the second line to the second line. The actual data in the file is 1,2,3,4,5\n6,7,8,9,0 So you … Read more

[Solved] Accessing data in a text file [closed]

Simply: #include <fstream> #include <iostream> int main() { std::fstream file(“table1.txt”); std::string word; while (file >> word) { // do whatever you want, e.g. print: std::cout << word << std::endl; } file.close(); return 0; } word variable will contain every single word from a text file (words should be separated by space in your file). 1 … Read more