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#include <iostream>
using namespace std;
uint8_t calculateWeekday( uint8_t day, uint8_t month, uint8_t century, uint8_t year ) {
const uint8_t monthFactor = ( ( month+9 ) % 12 ) + 1;
const uint8_t yearFactor = ( month > 2 ? year
: ( ( year + 100 -1 ) % 100 ) );
const uint8_t centuryFactor = month > 2 ? century
: year == 0 ? century - 1
: century;
//in zwei Berechnungen aufgeteilt,
//da die Zahl negativ werden könnte und
//das wird mit der while-Schleife korrigiert
uint8_t tmp1 = day + ( 2.6 * monthFactor - 0.2 ) + yearFactor +
( yearFactor/4 ) + ( centuryFactor/4 );
uint8_t tmp2 = 2 * centuryFactor;
while ( tmp1 < tmp2 ) {
tmp1+=7;
}
return (tmp1 - tmp2) % 7;
}
int main(){
//1=Montag,7=Sonntag
cout << unsigned( calculateWeekday( 30, 11, 20, 20 ) ) << endl;
}
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