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// Examples of things to do with Multiple-Subscripted Arrays, referencing p.273
#include <iostream>
#include <cstdlib>
#include <array>
#include <iomanip>
using namespace std;
int main()
{
//create a 3x2 table
const int rows = 3;
const int columns = 2;
int a[rows][columns] = { {} , {} }; //create a 3x2 table, initalize all data to 0, in all rows & columns
// enter numbers into the data
//int array_modification(int a, int 2)
int i, j;
int user_choice; // user inputs a row to display
int enter_data;
bool change = true;
// edit element variables
char edit_element, display_table, y, n;
int edit_row;
int edit_column;
int new_value;
cout << "Table is: " << rows << " x " << columns << endl;
// Populate data into Table
for (int i = 0; i < rows; i++)
{
//cout << "Enter data into Row " << i + 1;
for (int j = 0; j < columns; j++)
{
cout << "\nEnter data into Row " << i + 1 << ", Column " << j + 1 << " : ";
cin >> enter_data;
a[i][j] = enter_data; // place data into cell
}
}
// Display Table
cout << "\n" << endl;
cout << "Show full table: " << "\n" << endl;
for (i = 0; i < rows; i++)
{
for (j = 0; j < columns; j++)
{
cout << a[i][j] << " ";
}
cout << endl;
}
// Modify elements in table
while (change == true) // default set to true so this will code will run
{
cout << "\nDo you want to modify any elements in the table? (y/n): ";
cin >> edit_element;
if (edit_element == y)
{
// ask user to enter which element they want to change
cout << "Enter row #: ";
cin >> edit_row;
cout << "\nEnter column #: ";
cin >> edit_column;
cout << "\n\nEnter new value: ";
cin >> new_value;
a[edit_row][edit_column] = new_value;
}
else
{
break; // no more changes to table
}
cout << "Display Table? (y/n): ";
cin >> display_table;
if (display_table == y)
{ // call function which shows table
}
else
{// empty, loop back to top
}
// Show a row, chosen by the user
cout << "\n" << endl;
cout << "Enter a row number to show (1-" << rows << "): ";
cin >> user_choice;
for (j = 0; j < columns; j++)
{
cout << a[user_choice-1][j] << " "; // where a row_choice of 1 will equal 0 in the computer
}
// Show a column, chosen by the user
cout << "\n" << endl;
cout << "Enter a column number to show (1-" << columns << "): ";
cin >> user_choice;
for (i = 0; i < rows; i++)
{
cout << a[i][user_choice-1] << endl; // where a row_choice of 1 will equal 0 in the computer.
} // hold the column number constant, while increasing row number
// Sum a column, chosen by the user
cout << "\n" << endl;
cout << "Enter a column to sum (1-" << columns << "): ";
cin >> user_choice;
int column_sum = 0; // reset to 0
for (i = 0; i < rows; i++)
{
column_sum = column_sum + a[i][user_choice-1]; // where a row_choice of 1 will equal 0 in the computer
}
cout << "\nSum of Column " << user_choice << ": " << column_sum;
// Sum a row, chosen by the user
cout << "\n" << endl;
cout << "Enter a row to sum (1-" << rows << "): ";
cin >> user_choice;
int row_sum = 0; // reset to 0
for (j = 0; j < columns; j++)
{
row_sum = row_sum + a[user_choice-1][j]; // where a row_choice of 1 will equal 0 in the computer
}
cout << "\nSum of Row " << user_choice << ": " << row_sum << endl;
cin.get();
cin.ignore();
return 0;
}
}
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