mirror of
https://github.com/coding-horror/basic-computer-games.git
synced 2025-12-21 14:50:54 -08:00
251 lines
8.6 KiB
JavaScript
251 lines
8.6 KiB
JavaScript
// WEEKDAY
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//
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// Converted from BASIC to Javascript by Oscar Toledo G. (nanochess)
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//
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function print(str)
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{
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document.getElementById("output").appendChild(document.createTextNode(str));
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}
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function input()
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{
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return new Promise(function (resolve) {
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const input_element = document.createElement("INPUT");
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print("? ");
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input_element.setAttribute("type", "text");
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input_element.setAttribute("length", "50");
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document.getElementById("output").appendChild(input_element);
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input_element.focus();
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input_element.addEventListener("keydown", function (event) {
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if (event.keyCode === 13) {
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const input_str = input_element.value;
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document.getElementById("output").removeChild(input_element);
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print(input_str);
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print("\n");
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resolve(input_str);
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}
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});
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});
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}
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function tab(space)
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{
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let str = "";
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while (space-- > 0)
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str += " ";
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return str;
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}
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function fna(arg) {
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return Math.floor(arg / 4);
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}
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function fnb(arg) {
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return Math.floor(arg / 7);
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}
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// in a non-leap year the day of the week for the first of each month moves by the following amounts.
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const MONTHLY_DAY_OF_WEEK_OFFSETS = [0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5];
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/**
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* Reads a date, and extracts the date information.
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* This expects date parts to be comma separated, using US date ordering,
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* i.e. Month,Day,Year.
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* @returns {Promise<[number,number,number]>} [year, month, dayOfMonth]
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*/
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async function readDateElements() {
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let dateString = await input();
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const month = parseInt(dateString);
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const dayOfMonth = parseInt(dateString.substr(dateString.indexOf(",") + 1));
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const year = parseInt(dateString.substr(dateString.lastIndexOf(",") + 1));
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return [year, month, dayOfMonth];
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}
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/**
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* Returns a US formatted date, i.e. Month/Day/Year.
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* @param year
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* @param month
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* @param dayOfMonth
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* @returns {string}
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*/
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function getFormattedDate(year, month, dayOfMonth) {
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return month + "/" + dayOfMonth + "/" + year;
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}
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let k5;
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let k6;
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let k7;
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function time_spent(f, a8)
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{
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let k1 = Math.floor(f * a8);
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const i5 = Math.floor(k1 / 365);
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k1 -= i5 * 365;
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const i6 = Math.floor(k1 / 30);
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const i7 = k1 - (i6 * 30);
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k5 -= i5;
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k6 -= i6;
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k7 -= i7;
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if (k7 < 0) {
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k7 += 30;
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k6--;
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}
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if (k6 <= 0) {
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k6 += 12;
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k5--;
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}
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print(i5 + "\t" + i6 + "\t" + i7 + "\n");
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}
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function getDayOfWeek(dobYear, dobMonth, dobDayOfMonth) {
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const i1 = Math.floor((dobYear - 1500) / 100);
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let a = i1 * 5 + (i1 + 3) / 4;
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const i2 = Math.floor(a - fnb(a) * 7);
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const y2 = Math.floor(dobYear / 100);
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const y3 = Math.floor(dobYear - y2 * 100);
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a = y3 / 4 + y3 + dobDayOfMonth + MONTHLY_DAY_OF_WEEK_OFFSETS[dobMonth-1] + i2;
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let dayOfWeek = Math.floor(a - fnb(a) * 7) + 1;
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if (dobMonth <= 2) {
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if (y3 !== 0) {
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t1 = Math.floor(dobYear - fna(dobYear) * 4);
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} else {
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a = i1 - 1;
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t1 = Math.floor(a - fna(a) * 4);
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}
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if (t1 === 0) {
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if (dayOfWeek === 0) {
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dayOfWeek = 6;
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}
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dayOfWeek--;
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}
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}
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if (dayOfWeek === 0) {
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dayOfWeek = 7;
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}
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return dayOfWeek;
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}
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/**
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* The following performs a special hash on the day parts which guarantees
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* that different days will return different numbers, and the numbers returned are in ordered.
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* @param todayYear
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* @param todayMonth
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* @param todayDayOfMonth
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* @returns {*}
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*/
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function getNormalisedDay(todayYear, todayMonth, todayDayOfMonth) {
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return (todayYear * 12 + todayMonth) * 31 + todayDayOfMonth;
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}
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// Main control section
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async function main()
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{
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print(tab(32) + "WEEKDAY\n");
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print(tab(15) + "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY\n");
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print("\n");
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print("\n");
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print("\n");
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print("WEEKDAY IS A COMPUTER DEMONSTRATION THAT\n");
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print("GIVES FACTS ABOUT A DATE OF INTEREST TO YOU.\n");
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print("\n");
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print("ENTER TODAY'S DATE IN THE FORM: 3,24,1979 ");
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const [todayYear, todayMonth, todayDayOfMonth] = await readDateElements();
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// This program determines the day of the week
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// for a date after 1582
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print("ENTER DAY OF BIRTH (OR OTHER DAY OF INTEREST)");
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const [dobYear, dobMonth, dobDayOfMonth] = await readDateElements();
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print("\n");
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// Test for date before current calendar.
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// Note: this test is unreliable - the Gregorian calendar was introduced on Friday 15 October 1582
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// and the weekday algorithm fails for dates prior to that
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if (dobYear - 1582 < 0) {
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print("NOT PREPARED TO GIVE DAY OF WEEK PRIOR TO MDLXXXII.\n");
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} else {
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const dayOfWeek = getDayOfWeek(dobYear, dobMonth, dobDayOfMonth);
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const normalisedToday = getNormalisedDay(todayYear, todayMonth, todayDayOfMonth);
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const normalisedDob = getNormalisedDay(dobYear, dobMonth, dobDayOfMonth);
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if (normalisedToday < normalisedDob) {
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print(getFormattedDate(dobYear, dobMonth, dobDayOfMonth) + " WILL BE A ");
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} else if (normalisedToday === normalisedDob) {
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print(getFormattedDate(dobYear, dobMonth, dobDayOfMonth) + " IS A ");
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} else {
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print(getFormattedDate(dobYear, dobMonth, dobDayOfMonth) + " WAS A ");
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}
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switch (dayOfWeek) {
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case 1: print("SUNDAY.\n"); break;
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case 2: print("MONDAY.\n"); break;
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case 3: print("TUESDAY.\n"); break;
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case 4: print("WEDNESDAY.\n"); break;
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case 5: print("THURSDAY.\n"); break;
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case 6:
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if (dobDayOfMonth === 13) {
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print("FRIDAY THE THIRTEENTH---BEWARE!\n");
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} else {
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print("FRIDAY.\n");
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}
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break;
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case 7: print("SATURDAY.\n"); break;
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}
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if (normalisedToday !== normalisedDob) {
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let yearsBetweenDates = todayYear - dobYear;
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print("\n");
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let monthsBetweenDates = todayMonth - dobMonth;
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let daysBetweenDates = todayDayOfMonth - dobDayOfMonth;
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if (daysBetweenDates < 0) {
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monthsBetweenDates--;
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daysBetweenDates += 30;
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}
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if (monthsBetweenDates < 0) {
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yearsBetweenDates--;
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monthsBetweenDates += 12;
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}
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if (yearsBetweenDates >= 0) {
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if (daysBetweenDates === 0 && monthsBetweenDates === 0) {
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print("***HAPPY BIRTHDAY***\n");
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}
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print(" \tYEARS\tMONTHS\tDAYS\n");
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print(" \t-----\t------\t----\n");
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print("YOUR AGE (IF BIRTHDATE) \t" + yearsBetweenDates + "\t" + monthsBetweenDates + "\t" + daysBetweenDates + "\n");
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const a8 = (yearsBetweenDates * 365) + (monthsBetweenDates * 30) + daysBetweenDates + Math.floor(monthsBetweenDates / 2);
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k5 = yearsBetweenDates;
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k6 = monthsBetweenDates;
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k7 = daysBetweenDates;
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// Calculate retirement date.
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const e = dobYear + 65;
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// Calculate time spent in the following functions.
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print("YOU HAVE SLEPT \t\t\t");
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time_spent(0.35, a8);
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print("YOU HAVE EATEN \t\t\t");
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time_spent(0.17, a8);
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if (k5 <= 3) {
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print("YOU HAVE PLAYED \t\t\t");
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} else if (k5 <= 9) {
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print("YOU HAVE PLAYED/STUDIED \t\t");
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} else {
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print("YOU HAVE WORKED/PLAYED \t\t");
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}
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time_spent(0.23, a8);
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if (k6 === 12) {
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k5++;
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k6 = 0;
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}
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print("YOU HAVE RELAXED \t\t" + k5 + "\t" + k6 + "\t" + k7 + "\n");
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print("\n");
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print(tab(16) + "*** YOU MAY RETIRE IN " + e + " ***\n");
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print("\n");
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}
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}
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}
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print("\n");
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print("\n");
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print("\n");
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print("\n");
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print("\n");
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}
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main();
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