if ... else structure to find current age

[newkwesi]

Hello,
I am a beginner in python and programming in general.
I am trying to use the if...else structure to find the current
age of an individual, giving the current day, month
and year as well as birth day, month and
year. I keep getting a logical error which I am unable to correct.

I would be appreciate help in correcting the error in the structure.

# variables used in the if ... else structure
birthDay = 19
currentDay = 31
birthMonth = 12
currentMonth = 5
birthYear = 1990
currentYear = 2018
 
 
if current_year >= birth_year:
    if current_month >= birth_month:
        if current_day >= birth_day:
            print(current_year - birth_year)
        else:
            print(current_year - birth_year - 1)
    else:
        print(current_year - birth_year - 1)
else:
    print(current_year - birth_year - 1)
 
 
#The following were my test case:
#current_day = 31, 20, 16, 16, 16, 16, 6, 14, 31
#current_month = 5, 8, 6, 6, 6, 6, 10, 6, 5
#current_year = 2018, 2016, 2017, 2017, 2017, 2017, 2016, 2019, 2018
#birth_day = 19, 19, 20, 12, 11, 20, 17, 17, 24
#birth_month = 12, 4, 5, 9, 4, 6, 6, 3, 3
#birth_year = 1990, 1967, 1966, 2009, 1981, 2013, 1951, 2013, 1982
 
#Expected value = 27, 49, 51, 7, 36, 3, 65, 6, 36
#Result = 27, 49, 50, 7, 36, 3, 64, 5, 36
 

[SioSio]

I've included the complete code for you to understand.

This is your code.

import math
# variables used in the if ... else structure
birth_day = [19, 19, 20, 12, 11, 20, 17, 17, 24]
current_day = [31, 20, 16, 16, 16, 16, 6, 14, 31]
birth_month = [12, 4, 5, 9, 4, 6, 6, 3, 3]
current_month = [5, 8, 6, 6, 6, 6, 10, 6, 5]
birth_year = [1990, 1967, 1966, 2009, 1981, 2013, 1951, 2013, 1982]
current_year = [2018, 2016, 2017, 2017, 2017, 2017, 2016, 2019, 2018]
 
for i in range(len(birth_day)):
    if current_year[i] >= birth_year[i]:
        if current_month[i] >= birth_month[i]:
            if current_day[i] >= birth_day[i]:
                print(current_year[i] - birth_year[i])
            else:
                print(current_year[i] - birth_year[i] - 1)
        else:
            print(current_year[i] - birth_year[i] - 1)
    else:
        print(current_year[i] - birth_year[i] - 1)

Modified code.

for i in range(len(birth_day)):
    if current_year[i] >= birth_year[i]:
        if current_month[i] > birth_month[i]:
               print(current_year[i] - birth_year[i])
        else:
            if current_month[i] == birth_month[i]:
                if current_day[i] >= birth_day[i]:
                    print(current_year[i] - birth_year[i])
                else:
                    print(current_year[i] - birth_year[i] - 1)
            else:
                print(current_year[i] - birth_year[i] - 1)
    else:
        print( "Not Born yet")

Easier way.

for i in range(len(birth_day)):
    current = float(current_year[i]*10000+current_month[i]*100+current_day[i])
    birth = float(birth_year[i]*10000+birth_month[i]*100+birth_day[i])
    print(math.floor((current-birth)/10000.0))