First a small tip: Don't use swedish names in your code like that, make it a habit to use english everywhere since all companies in sweden that I've worked for uses english as the default language for code and documentation.
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#include <iostream>#include <string>#include <iomanip>using namespace std;void datuminmatning (int &ar, int &man, int &dag);//Reads the date you enter and sends it to the next functionsvoid skrivmanad(int nr);//Writes out the month (ex. January, February etc.)void skrivdatum(int &ar, int &manad, int &dag);//Writes out the datevoid skrivveckodag (int dagnummer);//Writes out the weeks day (ex. Monday, Tuesday)int antdagar(int ar, int man, int dag);//Counts the number of days starting from 1900int antdagarimanad(int ar, int man);//Counts the number of days in the specific month, loop years included.void almanacka(int &ar, int &manad);//Writes out the calendervoid main(){//ar = Year, man = Month, dag= Day, Manad = Month2 int ar=0, man=0, dag=0, manad=0; while (true) { datuminmatning(ar, man, dag); if (ar<1900) break; else if (man>12) cout << "ogiltig" << endl; else{ skrivdatum(ar, man, dag); almanacka(ar, man);} }}void datuminmatning(int &ar, int &man, int &dag){ cout << "skriv in en datum" << endl << "Året: ";//Asks you to enter a date, starting with Year cin >> ar; cout << "Månaden: ";//Month cin >> man; cout << "Dagen: ";//Day cin >> dag;}void skrivmanad(int nr){ switch(nr) { case 1: cout << "Januari"; return; case 2: cout << "Februari"; return; case 3: cout << "Mars"; return; case 4: cout << "April"; return; case 5: cout << "Maj"; return; case 6: cout << "Juni"; return; case 7: cout << "Juli"; return; case 8: cout << "Augustus"; return; case 9: cout << "September"; return; case 10: cout << "Oktober"; return; case 11: cout << "November"; return; case 12: cout << "December"; return; default: cout << "ogiltig"; return; }//Speaks for it's own, January - December}void skrivdatum(int &ar, int &manad, int &dag){ cout << "Datum är: "; skrivveckodag(antdagar(ar, manad, dag)%7); cout << " " << dag << " "; skrivmanad(manad); cout << " " << ar << endl;}void skrivveckodag(int dagnummer){ switch(dagnummer) { case 0: cout << "Söndag"; return; case 1: cout << "Måndag"; return; case 2: cout << "Tisdag"; return; case 3: cout << "Onsdag"; return; case 4: cout << "Torsdag"; return; case 5: cout << "Fredag"; return; case 6: cout << "Lördag"; return; default: cout << "ogiltig"; return; }//Sunday - Saterday, Ogiltig = invalid}int antdagar(int ar, int man, int dag){ int dagnummer=0; for (int nr=1900; nr<ar-1; ++nr) { dagnummer=dagnummer+365; if (ar%4==0) dagnummer=dagnummer+1; } for (int nr=1; nr<man-1; ++nr) { dagnummer=dagnummer+antdagarimanad(ar, man); } dagnummer=dagnummer+dag; return dagnummer;//Dagnummer= Daynumber}int antdagarimanad(int ar, int man){ int dagar=0; int yr=ar%4; if (yr==0){ switch (man) { case 1: dagar=31; return 31; case 2: dagar=28; return 29; case 3: dagar=31; return 31; case 4: dagar=30; return 30; case 5: dagar=31; return 31; case 6: dagar=30; return 30; case 7: dagar=31; return 31; case 8: dagar=31; return 31; case 9: dagar=30; return 30; case 10: dagar=31; return 31; case 11: dagar=30; return 30; case 12: dagar=31; return 31; default: cout << "ogiltig"; return 0; }} else{ switch (man) { case 1: dagar=31; return 31; case 2: dagar=29; return 28; case 3: dagar=31; return 31; case 4: dagar=30; return 30; case 5: dagar=31; return 31; case 6: dagar=30; return 30; case 7: dagar=31; return 31; case 8: dagar=31; return 31; case 9: dagar=30; return 30; case 10: dagar=31; return 31; case 11: dagar=30; return 30; case 12: dagar=31; return 31; default: cout << "ogiltig"; return 0; }}//dagar = Days}void almanacka(int &ar, int &manad){ int dagen=0; for(float nr=0;++nr<=1;) { cout << setw(8) << "sön" << setw(8) << "mån" << setw(8) << "tis" << setw(8) << "ons" << setw(8) << "tor" << setw(8) << "fre" << setw(8) << "lör"; cout << endl; } for(float nr=0;++nr<=1;) { for (float i=-1;++i<=6;){ if (i==antdagar(ar, manad, 1)%7){ dagen=1; } else if (i>antdagar(ar, manad, 1)%7) dagen=dagen+1; if (dagen==0){ cout << setw(8) << "";} else cout << setw(8) << dagen; } cout << endl; } for(float nr=0;++nr<=5;) { for (float i=-1;++i<=6;){ dagen=dagen+1; cout << setw(8) << dagen; if (dagen==antdagarimanad(ar, manad)) break; } cout << endl; if (dagen==antdagarimanad(ar, manad)) break; }}
I haven't looked through the complete code but one thing that I think is missing is that it's not true that every 4:th year have an extra day.
The rule is every fourth years EXCEPT every hundred years EXCEPT evey 400 hundred years.
The function I use:
bool hasExtraDay(const unsigned int year){ if ((year & 3) != 0) return false; if ((year % 400) == 0) return true; if ((year % 100) == 0) return false; return true;}
