// Please enter your birthday in this // format(including spaces): // DD MM YYYY // 22 01 1997 // I think that I have covered all possible // wrong inputs (17 by now)! // Please let me know if you find any other // bugs or wrong inputs that I haven't covered. // Thank you all for your support. // And if you liked it don't forget to give // a (+1) like. // Thank you all for the likes!!! // By @ John Thomas Jomy #include using namespace std; int main(void) { int DD = 32, MM = 13, YYYY = -1, NYYYY, NMM, IDAY, day, flag = 0; string month[] = {"January","February","March","April","May","June","July", "August","September","October","November","December"}; cin >> DD; cin >> MM; cin >> YYYY; //Error Message: User has given no input if(DD == 32 && MM == 13 && YYYY == -1) { cout << " Please enter your birthday in this " << endl; cout << " format(including spaces): " << endl; cout << " DD MM YYYY " << endl; cout << " 22 01 1997 " << endl; return -1; } if(DD <= 0) { //Error Message: User has given invalid input for "Days" & "Months" fields if(MM <= 0) { cout << " We don't have negative or null days and months. " << endl; cout << " Try again! " << endl; return -1; } //Error Message: User has given invalid input for "Days" field cout << " We don't have negative or null days. " << endl; cout << " Try again! " << endl; return -1; } if(MM <= 0) { //Error Message: User has given invalid input for "Months" field cout << " We don't have negative or null months. " << endl; cout << " Try again! " << endl; return -1; } if(DD > 31 || MM > 12 || YYYY <= 0) { if(DD > 31 && MM > 12) { //Error Message: User has given invalid input for "Days", "Months" & "Years" fields if(YYYY <= 0) { cout << " We have 12 months, the days of a month are up to 31 " << endl; cout << " and a year should be a positive number. " << endl; cout << " Try again! " << endl; } //Error Message: User has given invalid input for "Days" & "Months" fields else { cout << " We have 12 months and " << endl; cout << " the days of a month are up to 31. " << endl; cout << " Try again! " << endl; } } else if(DD > 31 && MM <= 12) { //Error Message: User has given invalid input for "Days" & "Years" fields if(YYYY <= 0) { cout << " The days of a month are up to 31 and " << endl; cout << " a year should be a positive number. " << endl; cout << " Try again! " << endl; } //Error Message: User has given invalid input for "Days" field else { cout << " The days of a month are up to 31. " << endl; cout << " Try again! " << endl; } } else if(DD <= 31 && MM > 12) { //Error Message: User has given invalid input for "Months" & "Years" fields if(YYYY <= 0) { cout << " We have 12 months and " << endl; cout << " a year should be a positive number. " << endl; cout << " Try again! " << endl; } //Error Message: User has given invalid input for "Months" field else { cout << " We have 12 months. " << endl; cout << " Try again! " << endl; } } //Error Message: User has given invalid input for "Years" field else if(DD <= 31 && MM <= 12 && YYYY <= 0) { cout << " A year should be a positive number. " << endl; cout << " Try again! " << endl; } return -1; } switch(MM) { case 2: if((YYYY % 400) == 0 || ((YYYY % 4) == 0 && (YYYY % 100) != 0)) { //Error Message: User has requested an invalid day for the month "February" // and the requested "Year" is a leap year. if(DD > 29) { cout << " The year " << YYYY << " is a leap year. " << endl; cout << " So, February has up to 29 days. " << endl; cout << " Try again! " << endl; return -1; } } else { //Error Message: User has requested an invalid day for the month "February" // and the requested "Year" is not a leap year. if(DD > 28) { cout << " The year " << YYYY << " isn't a leap year. " << endl; cout << " So, February has up to 28 days. " << endl; cout << " Try again! " << endl; return -1; } } break; case 4: //Error Message: User has requested an invalid day for the month "April" if(DD > 30) { cout << " April has up to 30 days. " << endl; cout << " Try again! " << endl; return -1; } break; case 6: //Error Message: User has requested an invalid day for the month "June" if(DD > 30) { cout << " June has up to 30 days. " << endl; cout << " Try again! " << endl; return -1; } break; case 9: //Error Message: User has requested an invalid day for the month "September" if(DD > 30) { cout << " September has up to 30 days. " << endl; cout << " Try again! " << endl; return -1; } break; case 11: //Error Message: User has requested an invalid day for the month "November" if(DD > 30) { cout << " November has up to 30 days. " << endl; cout << " Try again! " << endl; return -1; } break; } if(MM <= 2) { NYYYY = YYYY - 1; NMM = 0; } else { NYYYY = YYYY; NMM = (4 * MM + 23) / 10; } //Calculating the day IDAY = 365 * YYYY + DD + 31 * (MM - 1) - NMM + (NYYYY / 4) - ((3 * ((NYYYY / 100) + 1) / 4)); day = IDAY % 7; //This 'flag' is used for displaying the right ending after the numbers if(DD != 11 && DD != 12 && DD != 13) flag = DD % 10; switch(day) { case 0: cout << " You were born on a Saturday, "; break; case 1: cout << " You were born on a Sunday, "; break; case 2: cout << " You were born on a Monday, "; break; case 3: cout << " You were born on a Tuesday, "; break; case 4: cout << " You were born on a Wednesday, "; break; case 5: cout << " You were born on a Thursday, "; break; case 6: cout << " You were born on a Friday, "; break; } if(flag == 1){ cout << DD << "st of "; } else if(flag == 2){ cout << DD << "nd of "; } else if(flag == 3){ cout << DD << "rd of "; } else{ cout << DD << "th of "; } cout << month[MM-1] << " of " << YYYY << "!" << endl; cout << "Copyright 2020.All rights reserved." << endl; return 0; }

Birth Week Day Calculator Modified