Solved

function for person's age

Posted on 2000-04-17
7
269 Views
Last Modified: 2010-04-16
I need a function that calculates and returns a person's age in years based on his/her birthdate and current date. For example, a person born 5/30/68 would be 21 years old on 5/27/90.  Here's what I have so far:


var month, day, year: integer;
var curmonth, curday, curyr: integer;

function Age (month, day, year: integer
             curmonth, curday, curyr: integer): integer;
       var agemonth: integer;
       var ageday: integer;
       var ageyr: integer;
       var age: integer;

        begin
             agemonth:= curmonth - birmth;
             ageday:= curday - birday;
             ageyr:= curyr - birdyr;


begin {main}
  write ('Enter birth month, day, and year numerically ');
  readln (birmth, birday, birdyr);
  age := Age (month, day, year, curmonth, curday, curyr);
  writeln ('Your age is ', age)


0
Comment
Question by:kazooie21
7 Comments
 

Author Comment

by:kazooie21
ID: 2724671
Adjusted points from 30 to 50
0
 
LVL 47

Expert Comment

by:dbrunton
ID: 2725496
This is taken from the SWAG archive and I think it is what you need.



{
Allright... I checked around a lot of DATE and TIME routines, and came up
with this, taken from about three different routines. This routine works,
as far as I know, and I've implemented it successfully into my own code.
If anyone knows that this routine has a bug in it, please let me know.

This procedure uses the Julian calander mathmatical equasions to convert
two dates and give the # of days inbetween. If anyone knows a faster way
of writing this procedure, please let me know.
}

type
  string80=string[80];

var
  _retval:integer;

procedure check_date(stream1,stream2:string80);
var
  internal1,internal2:longint;
  JNUM:real;
  cd,month,day,year: integer;
  out:string[25];

    function Jul( mo, da, yr: integer): real;
    var
      i, j, k, j2, ju: real;
    begin
         i := yr;     j := mo;     k := da;
         j2 := int( (j - 14)/12 );
         ju := k - 32075 + int(1461 * ( i + 4800 + j2 ) / 4 );
         ju := ju + int( 367 * (j - 2 - j2 * 12) / 12);
         ju := ju - int(3 * int( (i + 4900 + j2) / 100) / 4);
         Jul := ju;
    end;

begin
  out:=copy(stream1,1,2);
  if copy(out,1,1)='0' then delete(out,1,1);
  val(out,month,cd);
  out:=copy(stream1,4,2);
  if copy(out,1,1)='0' then delete(out,1,1);
  val(out,day,cd);
  out:=copy(stream1,7,2);
  if copy(out,1,1)='0' then delete(out,1,1);
  val(out,year,cd);
  jnum:=jul(month,day,year);
  str(jnum:10:0,out);
  val(out,internal1,cd);
  out:=copy(stream2,1,2);
  if copy(out,1,1)='0' then delete(out,1,1);
  val(out,month,cd);
  out:=copy(stream2,4,2);
  if copy(out,1,1)='0' then delete(out,1,1);
  val(out,day,cd);
  out:=copy(stream2,7,2);
  if copy(out,1,1)='0' then delete(out,1,1);
  val(out,year,cd);
  jnum:=jul(month,day,year);
  str(jnum:10:0,out);
  val(out,internal2,cd);
  _retval:=internal1-internal2;
end;

begin
  check_date('01-01-95','01-01-94');
  writeln('The # of days inbetween is = ',_retval);
end.
0
 
LVL 2

Expert Comment

by:bratt030900
ID: 2731411
you should be able to do something like in the rest of your function:
           
             if ( ageday < 0) then
                  agemonth := agemonth-1;
           
             if (agemonth<0) then
                   ageyr :=ageyr-1;
             
             if (ageyr < 0 ) then
                /* bad date */
                ageyr:=0;
           
             age := ageyr;

/* of course this assumes the dates entered are valid dates*/
0
Threat Intelligence Starter Resources

Integrating threat intelligence can be challenging, and not all companies are ready. These resources can help you build awareness and prepare for defense.

 
LVL 47

Accepted Solution

by:
dbrunton earned 50 total points
ID: 2735435
program datediff;

var
  year1, month1, day1 : integer;
  year2, month2, day2 : integer;

procedure date_difference(y1, m1, d1, y2, m2, d2 : integer);
var
  yeardiff, monthdiff, daydiff, plus : integer;
  diffok : boolean;
begin
  yeardiff := 0;
  monthdiff := 0;
  daydiff := 0;
  plus := 0;
  diffok := true;
  if d1 >= d2 then
    daydiff := d1 - d2
  else
    begin
      daydiff := 31 - (d2 - d1);
      plus := 1;
    end;
  m2 := m2 + plus;
  plus := 0;
  if m1 >= m2 then
    monthdiff := m1 - m2
  else
    begin
      monthdiff := 12 - (m2 - m1);
      plus := 1;
    end;
  y2 := y2 + plus;
  if y1 >= y2 then
    yeardiff := y1 - y2
  else
    diffok := false;
  if diffok then
    begin
      write('The difference in dates is ', yeardiff, ' year(s) ', monthdiff);
       writeln(' month(s) ', daydiff, ' day(s)');
    end
  else
    writeln('Error.  The second date was more modern - bigger - than the first date');
end;

begin
  writeln('This program expects first date inputted to be newer - bigger - than 2nd');
  writeln('On next 3 lines enter year, month, day of first date');
  readln(year1);
  readln(month1);
  readln(day1);
  writeln('On next 3 lines enter year, month, day of second date');
  readln(year2);
  readln(month2);
  readln(day2);
  date_difference(year1, month1, day1, year2, month2, day2);
end.
0
 

Expert Comment

by:RoelPotman
ID: 2736088
Another suggestion/addition:

Success !

Age = (sysdate - birthdate) / 10000
   

Sysdate = date of today lay-out ccyymmdd for example 20001121 (Nov. 21, 2000)
Birthdate = lay-out ccyyymmdd for example 19921228 (Dec. 28, 1992)

Age=(20001121-19921228) /10000 = 79893 – 10000 = 7,9893 => 7 year
0
 

Expert Comment

by:RoelPotman
ID: 2737445
Sorry, my text was meant as a comment not as THE solution or answer.

Please advise me how to unlock, Roel
0
 

Expert Comment

by:RoelPotman
ID: 2738689
Ì hope this will unlock.
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
SQL Query issue 13 399
Real time Change DisplayName of service 7 597
HTTP-POST Delphi 7 5 2,731
Youtube stream inside Delphi 1 1,430
Short answer to this question: there is no effective WiFi manager in iOS devices as seen in Windows WiFi or Macbook OSx WiFi management, but this article will try and provide some amicable solutions to better suite your needs.
In  today’s increasingly digital world, managed service providers (MSPs) fight for their customers’ attention, looking for ways to make them stay and purchase more services. One way to encourage that behavior is to develop a dependable brand of prod…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
This video discusses moving either the default database or any database to a new volume.

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now