Question

C++
If I want to ask the user to input the variables in a vector, how can I do that?

I'm trying to implement this in a program with matrices. So the user should enter how many rows and columns they want, then enter the values

Can you help me out

Answer 1

#include <vector>
#include <iostream>
#include <string>

using namespace std;

int main() {
    int rows, columns, num;
    vector<vector<int> > matrix;
    // ask user for how many rows and columns
    cout << "Enter number of rows: ";
    cin >> rows;
    cout << "Enter number of columns: ";
    cin >> columns;
    // ask and read matrix
    for (int i = 0; i < rows; ++i) {
        vector<int> temp;
        for (int j = 0; j < columns; ++j) {
            cout << "Enter element at row " << i + 1 << " and columne " << j + 1 << ": ";
            cin >> num;
            temp.push_back(num);
        }
        matrix.push_back(temp);
    }
    // print matrix
    for (int i = 0; i < matrix.size(); ++i) {
        for (int j = 0; j < matrix[i].size(); ++j) {
            cout << matrix[i][j] << " ";
        }
        cout << endl;
    }
    cout << endl;
    return 0;
}