Merge pull request avinashkranjan#808 from mehabhalodiya/agecalc

Added Age Calculator GUI

Author: avinashkranjan

Age-Calculator-GUI/README.md

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+# Age Calculator GUI
+
+In this age calculator app, users can type in their date of birth, and the app will calculate and display their age. 
+
+## Step 1:
+
+First of all, we need to import two libraries into our code. The first one is the *tkinter* library. Then, we need the *datetime* library to work with dates.
+
+## Step 2:
+
+Now, let’s create a simple window for our app and name it as *Age Calculator*.
+
+## Step 3:
+
+Then, we are going to create four labels, each for the name, year, month, and the date, and put them in the grid.
+
+We will create entry fields to get the user inputs corresponding to all the labels created. Put them at the right side of the corresponding labels using the *grid* method.
+
+## Step 4:
+
+Then, we are going to define a function, which will calculate the age of the user by subtracting the user’s birth date from today’s date. We name that function as `ageCalc()`. 
+
+Then, we create a `Label` area that will display the age of the user as output in the function itself.
+
+## Step 5:
+
+Then, we are going to create a button for users to submit their input values. We link the button to the `ageCalc` function.
+
+Finally, let’s run everything inside the window using the `mainloop()` method.

Age-Calculator-GUI/age_calc_gui.py

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+# import libraries
+from tkinter import *
+from datetime import date
+
+# initialized window
+root = Tk()
+root.geometry('280x300')
+root.resizable(0,0)
+root.title('Age Calculator')
+statement = Label(root)
+
+# defining the function for calculating age
+def ageCalc():
+    global statement
+    statement.destroy()
+    today = date.today()
+    birthDate = date(int(yearEntry.get()), int(monthEntry.get()), int(dayEntry.get()))
+    age = today.year - birthDate.year
+    if today.month < birthDate.month or today.month == birthDate.month and today.day < birthDate.day:
+        age -= 1
+    statement = Label(text=f"{nameValue.get()}'s age is {age}.")
+    statement.grid(row=6, column=1, pady=15)
+
+# creating a label for person's name to display
+l1 = Label(text = "Name: ")
+l1.grid(row=1, column=0)
+nameValue = StringVar()
+
+# creating a entry box for input
+nameEntry = Entry(root, textvariable=nameValue)
+nameEntry.grid(row=1, column=1, padx=10, pady=10)
+
+# label for year in which user was born
+l2 = Label(text = "Year: ")
+l2.grid(row=2, column=0)
+yearValue = StringVar()
+yearEntry = Entry(root, textvariable=yearValue)
+yearEntry.grid(row=2, column=1, padx=10, pady=10)
+
+# label for month in which user was born
+l3 = Label(text = "Month: ")
+l3.grid(row=3, column=0)
+monthValue = StringVar()
+monthEntry = Entry(root, textvariable=monthValue)
+monthEntry.grid(row=3, column=1, padx=10, pady=10)
+
+# label for day/date on which user was born
+l4 = Label(text = "Day: ")
+l4.grid(row=4, column=0)
+dayValue = StringVar()
+dayEntry = Entry(root, textvariable=dayValue)
+dayEntry.grid(row=4, column=1, padx=10, pady=10)
+
+# create a button for calculating age
+button = Button(text="Calculate age", command=ageCalc)
+button.grid(row=5, column=1)
+
+# infinite loop to run program
+root.mainloop()