How can I extract and print every 5 digits from a txt file using C++ file i/o?

[ACLerok]

i have a txt file full of numbers and i just want to take the first 5 digits, save it has one number, shift over 1 digit, take another 5 digits, save it, and so on until the end of the file

here is the code

	fstream Prime;
	Prime.open("digitsofe.txt");
	
	if (!Prime.is_open()) { cout << "unable to open"; }
	else if (Prime.is_open()) {
		cout << "File opened successfully\n";
		Prime.getline(str2,6);
		cout << str2 << endl;
		Prime.seekg(1);
		Prime.getline(str2,6);
		cout << str2;
		
		Prime.close();
}

right now I'm just trying to print the first 5 digits and then the next 5 digits but the second number won't print. what am i doing wrong?

I tried using the get function but using atoi kept giving errors.

 

[basePARTICLE]

You are going right, so now, check the error flags in Prime.

cout << str2 << endl;

 

[quicknote]

As a scientist, there are a few things I would suggest to make this code more efficient and accurate. First, instead of using a fixed size for the string to store the digits, I would recommend using a dynamic array or vector to store the numbers. This will allow for more flexibility in case the file contains numbers with varying lengths.

Next, I would suggest using a loop to iterate through the file and extract the numbers in groups of 5 digits. This can be achieved by using the getline function and specifying the delimiter as a space or comma, depending on how the numbers are separated in the file.

Additionally, instead of using the seekg function to move to the next set of numbers, I would suggest using the tellg function to get the current position in the file and then using the seekg function to move to the next position. This will ensure that the program is always reading the next set of numbers, regardless of their length.

In terms of converting the string to an integer, instead of using atoi, I would recommend using the stoi function. This function allows you to specify the starting position and the number of characters to convert, which will be useful in this case.

Overall, my approach would be to read the file line by line, extract the numbers in groups of 5 digits, convert them to integers, and then store them in a dynamic array or vector. This will allow for easier manipulation of the numbers and printing them out in the desired format.