vb.net - Loop not looping and 2nd If not Iffing -

here's code

module module1  sub main()     dim yob integer     system.console.writeline("if kind input year of birth        tell how old are") loops:     try         yob = int32.parse(console.readline())     catch ex systemexception         console.writeline("that not number, try again.")         goto loops         end try     until yob > 0 , yob < datetime.today.year     loop     if yob < 0 or yob > datetime.today.year         console.writeline("you entered number either 0 or date in future.")         console.writeline("you can't born in future. c'mon son")         console.writeline("try again")     end if     dim age = datetime.today.year - yob     console.writeline("you " & age & " years old")     if age > 100         console.writeline("you born on 100 years ago , little known time since there no facebook, twitter or instagram people log every")         console.writeline(" thought, action, emotion, or take pictures of food before time")         console.readkey()     end if     if age > 90         console.writeline("you born in 20s")         console.writeline("in decade halloween born. first halloween celebration in america took place in anoka, minnesota in 1921. ")         console.readkey()     end if end sub  end module 

until added goto in try catch block loop run fine. doesn't , if input year bigger 2014 sits their. other problem have 2nd if doesn't work. if put in year makes age bigger 90 doesn't , program closes without performing if statements. ideas on what's wrong?

wow, goto. not everyday see 1 of those, , reason. shouldn't use it. there situations it's useful, not encounter 1 of them, ever.

the reason code stops year out of range have empty loop check year. variable can't change inside loop, loop never end.

you should use loop around input instead of after it, , checking inside loop. can use tryparse method instead of letting code throw exception, it's better check condition cause error instead of waiting happen:

dim yob integer system.console.writeline("if kind input year of birth        tell how old are") dim inputting boolean = true while inputting   dim input string = console.readline()   if int32.tryparse(input, yob)     if yob <= 0 or yob > datetime.today.year       console.writeline("you entered number either 0 or date in future.")       console.writeline("you can't born in future. c'mon son")       console.writeline("try again")     else       inputting = false     end if   else     console.writeline("that not number, try again.")   end if loop 

when test year makes me 94, second if statement works fine. however, checks lower bound, if enter year makes me 150 years old, still says born in twenties.

also, being between 90 , 100 doesn't mean born in twenties, being between 85 , 95 does. might want use actual birth year in condition instead of age:

if yob >= 1920 , yob <= 1929 

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side note: birth year not enough accurately determine age. if born 1994 it's not 20 years old, if haven't had birthday yet year, i'm still 19.