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Mod (Modulo) Function
Keywords: Mod (Modulo) Function
Question:
I copied the following code from the website but am confused by the "mod7". Can anyone tell me what this does and do you have to "unmod" an integer to make it behave like an integer in other mathematical functions. I am trying to find the date of the next Sunday after the current date, sounds easy eh !? Anyone have code for that ?
a=TimeYmdHms( )
b=TimeJulianDay(a)c=((b+5) mod 7) + 1
day=ItemExtract(c, "Sun Mon Tue Wed Thu Fri Sat", " ")
realdate = TimeJulToYmd(b)
line=StrCat("Julian Date-> ", b,@CRLF,"Day of week-> ",day,@CRLF,"Real date-> ",realdate)
Answer:
mod is the "modulo" function. Also sometimes known as the "remainder" function.Basically it means "divide by 7 and keep the remainder"
It is used to figure conver the julian date to a number between 0 and 6 that can be used to figure out the day of the week.
About the same as (baring typos)
bignum=123456 temp=bignum / 7 mod7 = bignum - (temp * 7)or just
mod7 = bignum mod 7
a=TimeYmdHms( )
b=TimeJulianDay(a)
c=((b+5) mod 7)
;Message("day of week 0 - 6",c)
days2sunday=7 - c
;Maybe if today is sunday, did you want *next* sunday?
; if days2sunday==0 then days2sunday=days2sunday+7
juliansunday=b+days2sunday
sunday=TimeJulToYmd(juliansunday)
Message("Sunday",sunday)
Article ID: W15503
File Created: 2003:05:28:10:20:48
Last Updated: 2003:05:28:10:20:48