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Counted Average Example
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multav0.cpp
#include <iostream>
using namespace std;

main()
{
        // Find out how many numbers to read.
        int how_many;           // The expected number of inputs.
        cout << "How many numbers you want to enter? ";
        cin >> how_many;

        // Numbers until we reach the count.
        int cnt = 0,            // Count of numbers read. 
            tot = 0;            // Total of numbers read.
        while(cnt < how_many) {
                // Read a number.
                int num;
                cin >> num;

                // Update stats.
                tot = tot + num;
                cnt = cnt + 1;
        }

        // Print the average.
        if(cnt > 0)
                cout << "Average is " << (double)tot /  (double)cnt << endl;
        else
                cout << "No numbers." << endl;
}

This uses a loop to take the average of several numbers. It asks for the count, then reads in that many numbers. Except for the I/O constructs, very similar to a Java method.

Note the query for the number of data points lacks an endl.