Solved 2019 Practical Paper ISC Computer Science — Question 1
Back to all questionsQuestion 1
Design a program to accept a day number (between 1 and 366), year (in 4 digits) from the user to generate and display the corresponding date. Also, accept 'N' (1 <= N <= 100) from the user to compute and display the future date corresponding to 'N' days after the generated date. Display an error message if the value of the day number, year and N are not within the limit or not according to the condition specified.
Test your program with the following data and some random data:
Example 1
INPUT:
DAY NUMBER: 255
YEAR: 2018
DATE AFTER (N DAYS): 22
OUTPUT:
DATE: 12TH SEPTEMBER, 2018
DATE AFTER 22 DAYS: 4TH OCTOBER, 2018
Example 2
INPUT:
DAY NUMBER: 360
YEAR: 2018
DATE AFTER (N DAYS): 45
OUTPUT:
DATE: 26TH DECEMBER, 2018
DATE AFTER 45 DAYS: 9TH FEBRUARY, 2019
Example 3
INPUT:
DAY NUMBER: 500
YEAR: 2018
DATE AFTER (N DAYS): 33
OUTPUT:
DAY NUMBER OUT OF RANGE
Example 4
INPUT:
DAY NUMBER: 150
YEAR: 2018
DATE AFTER (N DAYS): 330
OUTPUT:
DATE AFTER (N DAYS) OUT OF RANGE
Solution
import java.util.Scanner;
public class DateCalculator
{
public static boolean isLeapYear(int y) {
boolean ret = false;
if (y % 400 == 0) {
ret = true;
}
else if (y % 100 == 0) {
ret = false;
}
else if (y % 4 == 0) {
ret = true;
}
else {
ret = false;
}
return ret;
}
public static String computeDate(int day, int year) {
int monthDays[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
String monthNames[] = {"JANUARY", "FEBRUARY", "MARCH",
"APRIL", "MAY", "JUNE",
"JULY", "AUGUST", "SEPTEMBER",
"OCTOBER", "NOVEMBER", "DECEMBER"};
boolean leap = isLeapYear(year);
if (leap) {
monthDays[1] = 29;
}
int i = 0;
int daySum = 0;
for (i = 0; i < monthDays.length; i++) {
daySum += monthDays[i];
if (daySum >= day) {
break;
}
}
int date = day + monthDays[i] - daySum;
StringBuffer sb = new StringBuffer();
sb.append(date);
sb.append("TH ");
sb.append(monthNames[i]);
sb.append(", ");
sb.append(year);
return sb.toString();
}
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("DAY NUMBER: ");
int dayNum = in.nextInt();
System.out.print("YEAR: ");
int year = in.nextInt();
System.out.print("DATE AFTER (N DAYS): ");
int n = in.nextInt();
if (dayNum < 1 || dayNum > 366) {
System.out.println("DAY NUMBER OUT OF RANGE");
return;
}
if (n < 1 || n > 100) {
System.out.println("DATE AFTER (N DAYS) OUT OF RANGE");
return;
}
String dateStr = computeDate(dayNum, year);
int nDays = dayNum + n;
int nYear = year;
boolean leap = isLeapYear(year);
if (leap && nDays > 366) {
nYear = nYear + 1;
nDays = nDays - 366;
}
else if (nDays > 365) {
nYear = nYear + 1;
nDays = nDays - 365;
}
String nDateStr = computeDate(nDays, nYear);
System.out.println();
System.out.println("DATE: " + dateStr);
System.out.println("DATE AFTER " + n
+ " DAYS: " + nDateStr);
}
}Output
import
java.util.Scanner
;
public
class
DateCalculator
{
public
static
boolean
isLeapYear
(
int
y
) {
boolean
ret
=
false
;
if
(y
%
400
==
0
) {
ret
=
true
;
}
else
if
(y
%
100
==
0
) {
ret
=
false
;
}
else
if
(y
%
4
==
0
) {
ret
=
true
;
}
else
{
ret
=
false
;
}
return
ret;
}
public
static
String
computeDate
(
int
day
,
int
year
) {
int
monthDays[]
=
{
31
,
28
,
31
,
30
,
31
,
30
,
31
,
31
,
30
,
31
,
30
,
31
};
String
monthNames[]
=
{
"
JANUARY
"
,
"
FEBRUARY
"
,
"
MARCH
"
,
"
APRIL
"
,
"
MAY
"
,
"
JUNE
"
,
"
JULY
"
,
"
AUGUST
"
,
"
SEPTEMBER
"
,
"
OCTOBER
"
,
"
NOVEMBER
"
,
"
DECEMBER
"
};
boolean
leap
=
isLeapYear(year);
if
(leap) {
monthDays[
1
]
=
29
;
}
int
i
=
0
;
int
daySum
=
0
;
for
(i
=
0
; i
<
monthDays
.
length; i
++
) {
daySum
+=
monthDays[i];
if
(daySum
>=
day) {
break
;
}
}
int
date
=
day
+
monthDays[i]
-
daySum;
StringBuffer
sb
=
new
StringBuffer
();
sb
.
append(date);
sb
.
append(
"
TH
"
);
sb
.
append(monthNames[i]);
sb
.
append(
"
,
"
);
sb
.
append(year);
return
sb
.
toString();
}
public
static
void
main
(
String
args
[]) {
Scanner
in
=
new
Scanner
(
System
.
in);
System
.
out
.
print(
"
DAY NUMBER:
"
);
int
dayNum
=
in
.
nextInt();
System
.
out
.
print(
"
YEAR:
"
);
int
year
=
in
.
nextInt();
System
.
out
.
print(
"
DATE AFTER (N DAYS):
"
);
int
n
=
in
.
nextInt();
if
(dayNum
<
1
||
dayNum
>
366
) {
System
.
out
.
println(
"
DAY NUMBER OUT OF RANGE
"
);
return
;
}
if
(n
<
1
||
n
>
100
) {
System
.
out
.
println(
"
DATE AFTER (N DAYS) OUT OF RANGE
"
);
return
;
}
String
dateStr
=
computeDate(dayNum, year);
int
nDays
=
dayNum
+
n;
int
nYear
=
year;
boolean
leap
=
isLeapYear(year);
if
(leap
&&
nDays
>
366
) {
nYear
=
nYear
+
1
;
nDays
=
nDays
-
366
;
}
else
if
(nDays
>
365
) {
nYear
=
nYear
+
1
;
nDays
=
nDays
-
365
;
}
String
nDateStr
=
computeDate(nDays, nYear);
System
.
out
.
println();
System
.
out
.
println(
"
DATE:
"
+
dateStr);
System
.
out
.
println(
"
DATE AFTER
"
+
n
+
"
DAYS:
"
+
nDateStr);
}
}
Output