#include <iomanip>
#include <iostream>
using namespace std;
int main()
{
    int dow = 6;
    int day = 1 - dow;
    cout << " Sun Mon Tue Wed Thu Fri Sat" << endl;
    for(int row = 0; row < 6; row++)
    {
        for(int col = 0; col < 7; col++)
        {
            if(day < 1 || day > 31) {
                cout << setw(4) << "";
            }
            else {
                cout << setw(4) << day;
            }
            day++;
        }
        cout << endl;
    }
    return 0;
}

#include <iostream>
#include <cstdlib>
#include <iomanip>
using namespace std;
int main()
{
    const int NUM_ROLLS = 1000000;
    const int SCALE = NUM_ROLLS/333;
    int tally[13] = { 0 };
    srand(time(NULL));
    for(int i = 0; i < NUM_ROLLS; i++)
    {
        int r1 = rand() % 6 + 1;
        int r2 = rand() % 6 + 1;
        int sum = r1+r2;
        //cout << r1 << " + " << r2 << " = " << sum << endl;
        tally[sum]++;
    }
    for(int i = 2; i <= 12; i++)
    {
        cout << setfill(' ');
        cout << setw(3) << i
             << ": " << setw(9) << tally[i];

        cout << setfill('*') << setw(tally[i]/SCALE) << "";
        cout << endl;

    }

    return 0;
}

// factoring out a function
#include <iostream>
using namespace std;

int numDaysInMonth(int m)
{
    int days;
    switch(m) {
    case 2:
        days = 28;
        break;
    case 4: case 6: case 9: case 11:
        days = 30;
        break;
    default:
        days = 31;
    }
    return days;
}

int main()
{
    int month = 4;
    int prevMonth = month-1;
    if(prevMonth < 1) {
        prevMonth = 12;
    }
    int days = numDaysInMonth(month);
    int prevDays = numDaysInMonth(prevMonth);
    cout << prevDays << " then " << days << endl;
    return 0;
}