C inputting files into vectors
WebSep 12, 2024 · 9. void read_data (ifstream& is, vector >& m) { int item; while (!is.eof ()) { is >> item; m.push_back (vector {item}); } } doesn't entirely work yet as the vector subscript is now out of range, but presents the numbers from the file. Albeit the output of those numbers are messed up as they're displayed in a vertical fashion ... WebMar 17, 2024 · I'm trying to read the data from a text file and store it in some vectors. Here is the input file and the code: Input file: 3 0 Paul 1 Peter 2 David 0 3 Chicago Boston Memphis 1 1 Boston 2 0 The first line "n" represents the number of people. The next "n" lines represent the ID number, and name of each individual.
C inputting files into vectors
Did you know?
WebAug 13, 2024 · def.pop_back(line);//too many arguments in a function call (red line on "line")The correct method is push_back, see vector::push_back[]. The pop_back method is used for deleting the last element of the vector. WebJul 15, 2024 · vector readFile (const string& fileName) { ifstream source; source.open (filename); vector lines; string line; while (getline (source, line) { lines.push_back (line); } return lines; } int main (int argc, char ** argv) { string inputFile (argv [1]); vector fileData = readFile (inputFile); // Check vector for (auto i : fileData) cout << i << endl; …
WebAug 3, 2024 · The use of 'vector<>>' symbolizes that we are working on a vector of vectors. Each value inside the first set of braces, like ' {1, 0, 1}' and ' {0, 1}' are vectors independently. Note: To create 2D vectors in C++ of different data-type, we can place the data-type inside the innermost angle brackets like . WebJul 11, 2024 · using namespace std; void read_csv (const string &filename) { //File pointer fstream fin; //open an existing file fin.open (filename, ios::in); vector>> predict; string line; while (getline (fin, line)) { std::istringstream sin (line); vector preds; double pred; while (getline (sin, pred, ']')) { preds.push_back (preds); } } …
WebMar 30, 2024 · Here are some basic commands and function to regarding with matrices and vector in Octave : 1. The dimensions of the matrix : We can find the dimensions of a matrix or vector using the size () function. MATLAB % declaring the matrix M = [1 2 3; 4 5 6; 7 8 9]; % dimensions of the matrix size (M) % number of rows rows = size (M, 1) WebJul 30, 2024 · You can then read directly into the vector 's elements #include #include int main () { std::vector w (3), x (3), y (3), z (3); std::ifstream f_read ("data.txt"); for (int i = 0; i < 3; ++i) { f_read >> w [i] >> x [i] >> y [i] >> z [i]; } return 0; }
WebJun 12, 2024 · 2 Answers. Sorted by: 2. You can use getline to read the file line by line into strings. For each string you read, iterate over its characters to build row vectors to populate your forest: #include #include #include #include int main () { std::string line; std::ifstream infile ("file.txt"); std::vector
WebNov 12, 2013 · #include #include #include using namespace std; vector arr1; vector arr2; vector arr3; int main () { int i; string str; double d; ifstream fin ("myfile.txt"); if (fin.is_open ()) { while (!fin.eof ()) { fin >> i >> str >> d; fin.ignore (std::numeric_limits::max (), '\n'); arr1.push_back (i); arr2.push_back (str); arr3.push_back (d); } } return 0; … the pheasant at buckland betchworth surreyWebAug 27, 2011 · EDIT. To use this function for the whole CSV file, you have to read your file one line at a time and apply the split_at_commas function to each line. Like this. string row; while (getline (wInv, row)) { vector values = split_at_commas (row); // do something depending on the values you've got } Hope this helps. sick and annualWebAug 28, 2016 · Shows using C++ vectors, including using find_if and copy_if. How to use back_inserter. Also a trick to slurp a whole file into a vector.Get the code at: h... the pheasant annahilt menusick and back painWebJul 22, 2024 · 1) Dont' name your variable "STRING". By convention, all-uppercase names are reserved for C/C++ macos. 2) Read about std::vector. In particular, read about v.push_back (line); 3) In this case, you forgot to initialize the size. *BUT YOU SHOULDN'T HARD CODE "7". That defeats the whole purpose of having a variable length "vector" : (!!!! sick and bereavement ministryWebJul 16, 2013 · Put the text data into a stringstream and use std::getline.. It takes an optional third parameter which is the "end-of-line" character, but you can use ; instead of a real end of line.. Call while (std::getline(ss, str, ';')) {..} and each loop puts the text in std::string.. Then you will need to convert to a number data type and push into a vector but this will get … the pheasant at great chishillWebAug 28, 2016 · Shows using C++ vectors, including using find_if and copy_if. How to use back_inserter. Also a trick to slurp a whole file into a vector. Get the code at: … sick and bereavement