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Find the last Sunday of each month: Difference between revisions
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* [[Five weekends]]
* [[Day of the week]]
* [[
=={{header|C++}}==
<lang cpp>
#include <windows.h>
#include <iostream>
#include <string>
//--------------------------------------------------------------------------------------------------
using namespace std;
//--------------------------------------------------------------------------------------------------
class lastSunday
{
public:
lastSunday()
{
m[0] = "JANUARY: "; m[1] = "FEBRUARY: "; m[2] = "MARCH: "; m[3] = "APRIL: ";
m[4] = "MAY: "; m[5] = "JUNE: "; m[6] = "JULY: "; m[7] = "AUGUST: ";
m[8] = "SEPTEMBER: "; m[9] = "OCTOBER: "; m[10] = "NOVEMBER: "; m[11] = "DECEMBER: ";
}
void findLastSunday( int y )
{
year = y;
isleapyear();
int days[] = { 31, isleap ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
d;
for( int i = 0; i < 12; i++ )
{
d = days[i];
while( true )
{
if( !getWeekDay( i, d ) ) break;
d--;
}
lastDay[i] = d;
}
display();
}
private:
void isleapyear()
{
isleap = false;
if( !( year % 4 ) )
{
if( year % 100 ) isleap = true;
else if( !( year % 400 ) ) isleap = true;
}
}
void display()
{
system( "cls" );
cout << " YEAR " << year << endl << "=============" << endl;
for( int x = 0; x < 12; x++ )
cout << m[x] << lastDay[x] << endl;
cout << endl << endl;
}
int getWeekDay( int m, int d )
{
int y = year;
int f = y + d + 3 * m - 1;
m++;
if( m < 3 ) y--;
else f -= int( .4 * m + 2.3 );
f += int( y / 4 ) - int( ( y / 100 + 1 ) * 0.75 );
f %= 7;
return f;
}
int lastDay[12], year;
string m[12];
bool isleap;
};
//--------------------------------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
int y;
lastSunday ls;
while( true )
{
system( "cls" );
cout << "Enter the year( yyyy ) --- ( 0 to quit ): ";
cin >> y;
if( !y ) return 0;
ls.findLastSunday( y );
system( "pause" );
}
return 0;
}
//--------------------------------------------------------------------------------------------------
</lang>
Output:
<pre>
YEAR 2013
=============
JANUARY: 27
FEBRUARY: 24
MARCH: 31
APRIL: 28
MAY: 26
JUNE: 30
JULY: 28
AUGUST: 25
SEPTEMBER: 29
OCTOBER: 27
NOVEMBER: 24
DECEMBER: 29
</pre>
=={{header|REXX}}==
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