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https://github.com/coding-horror/basic-computer-games.git
synced 2025-12-22 07:10:42 -08:00
95 Workday - introduce some comments, and methods; improve some variable names; spotted a bug
This commit is contained in:
Steve Bosman
@@ -46,7 +46,33 @@ function fnb(arg) {
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return Math.floor(arg / 7);
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}
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const t = [, 0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5];
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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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@@ -73,6 +99,46 @@ function time_spent(f, a8)
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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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@@ -85,59 +151,38 @@ async function main()
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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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let str = await input();
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const m1 = parseInt(str);
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const d1 = parseInt(str.substr(str.indexOf(",") + 1));
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const y1 = parseInt(str.substr(str.lastIndexOf(",") + 1));
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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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str = await input();
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const m = parseInt(str);
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const d = parseInt(str.substr(str.indexOf(",") + 1));
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const y = parseInt(str.substr(str.lastIndexOf(",") + 1));
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const [dobYear, dobMonth, dobDayOfMonth] = await readDateElements();
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print("\n");
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const i1 = Math.floor((y - 1500) / 100);
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// Test for date before current calendar.
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if (y - 1582 < 0) {
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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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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(y / 100);
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const y3 = Math.floor(y - y2 * 100);
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a = y3 / 4 + y3 + d + t[m] + i2;
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let b = Math.floor(a - fnb(a) * 7) + 1;
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if (m <= 2) {
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if (y3 !== 0) {
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t1 = Math.floor(y - fna(y) * 4);
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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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a = i1 - 1;
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t1 = Math.floor(a - fna(a) * 4);
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print(getFormattedDate(dobYear, dobMonth, dobDayOfMonth) + " WAS A ");
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}
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if (t1 === 0) {
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if (b === 0)
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b = 6;
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b--;
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}
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}
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if (b === 0)
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b = 7;
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if ((y1 * 12 + m1) * 31 + d1 < (y * 12 + m) * 31 + d) {
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print(m + "/" + d + "/" + y + " WILL BE A ");
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} else if ((y1 * 12 + m1) * 31 + d1 === (y * 12 + m) * 31 + d) {
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print(m + "/" + d + "/" + y + " IS A ");
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} else {
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print(m + "/" + d + "/" + y + " WAS A ");
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}
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switch (b) {
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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 (d === 13) {
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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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@@ -145,31 +190,32 @@ async function main()
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break;
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case 7: print("SATURDAY.\n"); break;
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}
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if ((y1 * 12 + m1) * 31 + d1 !== (y * 12 + m) * 31 + d) {
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let i5 = y1 - y;
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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 i6 = m1 - m;
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let i7 = d1 - d;
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if (i7 < 0) {
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i6--;
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i7 += 30;
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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 (i6 < 0) {
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i5--;
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i6 += 12;
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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 (i5 >= 0) {
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if (i7 === 0 && i6 === 0)
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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" + i5 + "\t" + i6 + "\t" + i7 + "\n");
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const a8 = (i5 * 365) + (i6 * 30) + i7 + Math.floor(i6 / 2);
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k5 = i5;
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k6 = i6;
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k7 = i7;
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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 = y + 65;
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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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