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October 22, 2012 10:59
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Mediante la congruencia de Zeller averiguar qué día de la semana es cualquier fecha
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// zeller.cpp | |
// juanfc 2012-10-22 | |
// Mediante la Congruencia_de_Zeller averiguar | |
// qué día de la semana es cualquier fecha posterior al | |
// 4 de octubre de 1582 | |
// Usa: http://es.wikipedia.org/wiki/Congruencia_de_Zeller | |
// y http://es.wikipedia.org/wiki/Calendario_gregoriano | |
#include <iostream> | |
using namespace std; | |
// tipos | |
enum TDiaSem {LUNES, MARTES, MIERCOLES, JUEVES, VIERNES, SABADO, DOMINGO}; | |
// prototipos | |
TDiaSem diaSemana(const unsigned d, const unsigned m, const unsigned y); | |
void escribeDiaSem(TDiaSem ds); | |
int Menu(); | |
// principal | |
int main() | |
{ | |
bool seguir = true; | |
do { | |
switch (Menu()) { | |
case 0: | |
seguir = false; | |
break; | |
case 1: | |
do { | |
int day, month, year; | |
cout << "\nIntroduzca día mes año:? "; | |
cin >> day; | |
if (day == 0) break; | |
cin >> month; | |
if (month == 0) break; | |
cin >> year; | |
cout << "la fecha " << day << "/" << month << "/" << year | |
<< " cae en "; | |
// hacer llamada y con el resultado, switch | |
escribeDiaSem( diaSemana(day, month, year) ); | |
} while (true); | |
break; | |
} | |
} while ( seguir ); | |
return 0; | |
} | |
// procedimientos | |
int Menu() | |
{ | |
unsigned opc; | |
do { | |
cout << "\n --MENU--\n"; | |
cout << "0) Salir.\n"; | |
cout << "1) Dia de la semana.\n\n"; | |
cout << "-Introduzca la opcion que desee: "; | |
cin >> opc; | |
cin.ignore(1000, '\n'); | |
} while (opc > 3); | |
return opc; | |
} | |
TDiaSem diaSemana (const unsigned d, const unsigned m, const unsigned y) | |
{ | |
unsigned z, a, b, c; | |
if (m <= 2) { | |
a = m + 10 ; | |
b = (y - 1) % 100; | |
c = (y - 1) / 100; | |
} else if (m >= 3) { | |
a = m - 2; | |
b = y % 100; | |
c = y / 100; | |
} | |
z = (700 + (26 * a - 2) / 10 + d + b + b / 4 + c / 4 - 2 * c - 1) % 7; | |
return TDiaSem(z); | |
} | |
void escribeDiaSem(TDiaSem ds) | |
{ | |
switch (ds) { | |
case LUNES: cout << "LUNES\n"; break; | |
case MARTES: cout << "MARTES\n"; break; | |
case MIERCOLES: cout << "MIÉRCOLES\n"; break; | |
case JUEVES: cout << "JUEVES\n"; break; | |
case VIERNES: cout << "VIERNES\n"; break; | |
case SABADO: cout << "SÁBADO\n"; break; | |
case DOMINGO: cout << "DOMINGO\n"; break; | |
default: cout << "** ERROR **\n"; | |
} | |
} |
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