Answer to Question #179072 in C++ for paul

Question

Make a C++ program that will print the multiplication table using nested loop.

Answer 1

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int rows, columns, count, count_row, count_column;
    bool r = 0, c = 0;   // flags when determining the correct input
                         // of the number of rows and columns
     // input rows & colomns and validation
    while (!r)  // the number of rows is correct?
    {
        cout << "Please enter a number of rows on the interval [1, 10]: ";
        cin >> rows;
        if (cin.fail() || rows<1 || rows>10) {
            cout << "\nThat is not within the interval  [1, 10]. Pleace try again... " << endl;
            cin.clear();            // clears the error flag
            cin.ignore(24, '\n');    // Extracts characters from the input sequence and discards them
        }
        else {
            r = 1;        // number of rows is correct
            while (!c) {  // the number of columns is correct?
                cout << "Please enter a number of columns on the interval [1, 10]: ";
                cin >> columns;
                if (cin.fail() || columns<1 || columns>10) {
                    cout << "\nThat is not within the interval  [1, 10]. Pleace try again... " << endl;
                    cin.clear();            // clears the error flag
                    cin.ignore(24, '\n');    // Extracts characters from the input sequence and discards them
                }
                else
                    c = 1;    // number of columnsis  correct
            }
        }
    }
    // The declaration of a two-dimensional dynamic array:
    int **ptrarray = new int*[rows];
    for (count = 0; count < rows; count++)     //  rows in array
        ptrarray[count] = new int[columns];    //columns
                                               //   ptrarray  – array ptr
     // recorded data in  a two-dimensional dynamic array  
    for (count_row = 0; count_row < rows; count_row++)
        for (count_column = 0; count_column < columns; count_column++)
            ptrarray[count_row][count_column] = (count_column + 1)*(count_row + 1); //  // recorded data in two-dimensional dynamic array  
// output on display
    cout << endl;
    cout << "   |";
    for (count_column = 0; count_column < columns; count_column++)
        cout << setw(3) << count_column + 1 << "|";        // number of columns
    cout << endl;
    for (count_column = 0; count_column <= columns; count_column++)
        cout << "---+";
    cout << endl;
    count_column = 0;
    for (count_row = 0; count_row < rows; count_row++) {        // output number of each row
        cout << setw(3) << count_row + 1 << "|";   // number of rows
        while (count_column<columns) {
            cout << setw(3) << ptrarray[count_row][count_column] << "|";   //  output rezult of multiplication
            count_column++;        // next value in row
        }
        count_column = 0; // before the next row, zero the column number
        cout << endl;
        for (count = 0; count <= columns; count++) // output of the dividing line in the table
            cout << "---+";

        cout << endl;
    }
    // Deleting a two-dimensional dynamic array
    for (count = 0; count < rows; count++)
        delete[]ptrarray[count];

    cout << endl;
    
    return 0;
}