Example 3 at Library

gistfile1.cpp

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
	//Note that in the below example I do not validate the numbers. This is bad practice. Don't do it.
	int numStudents,
		numScores,	//Values can be separated by comma if they have the same base type.
		**scores;	//For declaring pointers like this, the ** is associated with the value separated by the comma.
					//scores is an array of arrays.


	//scores is a pointer to the first element in an array of pointers, where each pointer points to the first element
	//of the array of scores for that specific student.

	cout << "Enter a number of students: ";

	cin >> numStudents; //Get number of students.

	scores = new int*[numStudents]; //Create scores as a new array of int arrays of numStudents size.
	//Note that arrays are just pointers to the first element in the array.

	cout << "Enter number of scores: ";

	cin >> numScores; //Get number of scores.

	for (int i = 0; i < numStudents; i++) //Loop from 0 to < numStudents. Note that the value at numStudents is not included. So: 0 to numStudents - 1
	{
		scores[i] = new int[numScores]; //Set the scores pointer at i to be a new array of numScores size.
		for (int j = 0; j < numScores; j++) //Loop from 0 to < numScores
		{
			cout << "Enter score[" << j << "] for student[" << i << "]: ";
			cin >> scores[i][j]; //Set value of array at i, at that array's element j, to the read value.
		}
	}

	for (int i = 0; i < numStudents; i++) //Loop from 0 to < numStudents.
	{
		//Show the score array at i.
		cout << "Student " << i << ":" << endl;
		for (int j = 0; j < numScores; j++) //Loop from 0 to < numScores.
		{
			cout	<< setw(4) //Set next width to 4 characters.
					<< scores[i][j]; //Print scores at array i, at that array's element j.
		}
		cout << endl; //New line in prep for outputting next student.
	}

	return 0; //Result to be sent back to the OS once this is complete.
}