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Last Friday of each month: Difference between revisions
Added solution for Action!
(Added Algol 68) |
(Added solution for Action!) |
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2016-11-25
2016-12-30
</pre>
=={{header|Action!}}==
<lang Action!>;https://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week#Sakamoto.27s_methods
BYTE FUNC DayOfWeek(INT y BYTE m,d) ;1<=m<=12, y>1752
BYTE ARRAY t=[0 3 2 5 0 3 5 1 4 6 2 4]
BYTE res
IF m<3 THEN
y==-1
FI
res=(y+y/4-y/100+y/400+t(m-1)+d) MOD 7
RETURN (res)
BYTE FUNC IsLeapYear(INT y)
IF y MOD 100=0 THEN
IF y MOD 400=0 THEN
RETURN (1)
ELSE
RETURN (0)
FI
FI
IF y MOD 4=0 THEN
RETURN (1)
FI
RETURN (0)
INT FUNC GetMaxDay(INT y BYTE m)
BYTE ARRAY MaxDay=[31 28 31 30 31 30 31 31 30 31 30 31]
IF m=2 AND IsLeapYear(y)=1 THEN
RETURN (29)
FI
RETURN (MaxDay(m-1))
PROC PrintB2(BYTE x)
IF x<10 THEN
Put('0)
FI
PrintB(x)
RETURN
PROC Main()
INT MinYear=[1753],MaxYear=[9999],y
BYTE m,d,last,maxD
DO
PrintF("Input year in range %I...%I: ",MinYear,MaxYear)
y=InputI()
UNTIL y>=MinYear AND y<=MaxYear
OD
FOR m=1 TO 12
DO
last=0
maxD=GetMaxDay(y,m)
FOR d=1 TO maxD
DO
IF DayOfWeek(y,m,d)=5 THEN
last=d
FI
OD
PrintI(y) Put('-)
PrintB2(m) Put('-)
PrintB2(last) PutE()
OD
RETURN</lang>
{{out}}
[https://gitlab.com/amarok8bit/action-rosetta-code/-/raw/master/images/Last_Friday_of_each_month.png Screenshot from Atari 8-bit computer]
<pre>
Input year in range 1753...9999: 2021
2021-01-29
2021-02-26
2021-03-26
2021-04-30
2021-05-28
2021-06-25
2021-07-30
2021-08-27
2021-09-24
2021-10-29
2021-11-26
2021-12-31
</pre>
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