1#include <iostream>2using namespace std;34int DAY, MONTH, YEAR;5int tempyear;6int incorrect;7int leapyear;8int anchorday;9// int daysinmonth = 31;10int base;11int temp;12int sum;13string month;14string day;1516void tellDay(int date) {17    date %=7;18    switch (date){19        case 1:20            day = "Monday";21            break;22        case 2:23            day = "Tuesday";24            break;25        case 3:26            day = "Wednesday";27            break;28        case 4:29            day = "Thursday";30            break;31        case 5:32            day = "Friday";33            break;34        case 6:35            day = "Saturday";36            break;37        default: 38            day = "Sunday";39            break;40    }41    cout << day << endl;42}4344int main () {45    incorrect = 0;46    leapyear = 0;4748    cout<<"Welcome To Doomsday Date Machine\n\n";49    cout<<"Choose any date using the Doomsday Algorithm\n";50    cout<<"This Machine will tell you the Day of the Week\n\n";5152    cout<<"Tell me Year: ";53        54    cin >> YEAR;55    // cout << YEAR;5657    // int chckyearnleap () { // checked58    // if corect year / non negtive59    if (YEAR < 0){60        incorrect = 1;61        cout<<"\nNegative years not allowed, since it only works for gegrian calender\n";62    }6364    else if(((YEAR%4 == 0) && (YEAR%400 == 0)) || ((YEAR%4 == 0) && (YEAR%100 != 0))){65        cout<<"\nWow its a Leap year\n";66        leapyear = 1;67    }6869    // int findanchor () { //checked70    //base 2000 tuesday SFWT->71    base = 2;72    tempyear = YEAR;// 190073    tempyear /= 100; // 1974    temp = tempyear - 20; // -175    temp %= 4;// -176    // if -ve77    if (temp<0){78        temp += 4;// 379    }80    // if +ve81    if (temp == 3)82        base = 3; //383    else if (temp == 2)84        base = 5;85    else if (temp == 1)86        base = 0;//87    //base done // 88    cout << "\nCentury Anchor/start will be a : ";89    tellDay(base);9091    cout<<"\nTell me Month: ";92    cin >> MONTH;93    // cout << MONTH;9495    // int finddoomsdydate () {// checked , ps: change anchor anchorday name96    anchorday = 12;97    switch (MONTH){98        case 1:99            anchorday = 3;100            // daysinmonth = 31;101            if (leapyear){102                anchorday = 4;103            }104            month = "january";105            break;106        case 2:107            anchorday = 28;108            // daysinmonth = 28;109            if (leapyear){110                anchorday = 29;111                // daysinmonth = 29;112            }113            month = "feburary";114            break;115        case 3:116            anchorday = 14;117            // daysinmonth = 31;118            month = "march";119            break;120        case 4:121            anchorday = 4;122            // daysinmonth = 30;123            month = "april";124            break;125        case 5:126            anchorday = 9;127            // daysinmonth = 31;128            month = "may";129            break;130        case 6:131            anchorday = 6;132            // daysinmonth = 30;133            month = "june";134            break;135        case 7:136            anchorday = 11;137            // daysinmonth = 31;138            month = "july";139            break;140        case 8:141            anchorday = 8;142            // daysinmonth = 31;143            month = "august";144            break;145        case 9:146            anchorday = 5;147            // daysinmonth = 30;148            month = "september";149            break;150        case 10:151            anchorday = 10;152            // daysinmonth = 31;153            month = "october";154            break;155        case 11:156            anchorday = 7;157            // daysinmonth = 30;158            month = "november";159            break;160        default:161            // daysinmonth = 31;162            month = "december";163    }164    cout << "\nYoure choosen month is: "<<month << endl;165    cout<<"In this month the Doomsday  is at: "<< anchorday << endl;166167    cout<<"\nTell me Day: ";168    cin >> DAY;169    // cout << DAY << endl;170171    // int dateincorrect () { // chck not in use currently172    if (incorrect){173        //#message174        cout << "\nIncorrect Date please try Again\n";175    }176    // }177178    //doomsdays  // checked179    /*180        january 3-4       | 1/3-4181        feburary 28-29    | 2/28-29182        march - 14        | 3/14183        april - 4         | 4/4184        may - 9           | 5/9185        june - 6          | 6/6186        july - 11         | 7/11187        august - 8        | 8/8188        september - 5     | 9/5189        october - 10      | 10/10190        november - 7      | 11/7191        december - 12     | 12/12192    */193194    // doomsday();195    // int doomsday () { // checked , 2003 2000 1999196    // fingers197    // base198    // tempyear / 12199    // temp = tempyear % 12200    // temp / 4201202    sum = 0;203    tempyear = YEAR; // 2000204    tempyear %= 100; // 00 205206    temp = tempyear % 12; //  0207208    // cout << "\nBase = " << base << endl;209    sum += base; // 2210    // cout << "\nBase = " << base << endl;211    sum += tempyear / 12; // 0212    // cout << "\nBase = " << base << endl;213    sum += tempyear % 12; // 0214    // cout << "\nBase = " << base << endl;215    sum += temp / 4; // 0216    // cout << "\nBase = " << base << endl;217    // 218    sum %= 7; // 2219    // cout << "\nBase = " << base << endl;220221222    cout<< "\nDoomsday is at " << sum << "th day of the week -> ";223    tellDay(sum); 224225    // calculateDay();226    // int calculateDay () {227    //temp228    //sum -> day of doomsday229    //achorday -> date of doomsday 230    //DAY is date of which day is to be calculated231    temp = DAY - anchorday;232    temp %= 7;233234    if (temp < 0){235        temp += 7;236    }237    temp += sum;238    temp %= 7;239    // }    240241    // tellDay(temp);242243244    // cout<<"\n day = " << day << "\n";245    cout << "\nSo on Year " << YEAR << " / " ;246    cout << MONTH << " / " << DAY;247    cout<< "TH \nthe Day of the week is ";248    tellDay(temp); 249250    cout << endl; 251252    return 0;253254}