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<blockquote data-quote="SL MULTIMEDIA TUTORIAL" data-source="post: 27465798" data-attributes="member: 575597">meka karaganna Code eka kohomada wenas karanna one&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile&nbsp; &nbsp; :-)" loading="lazy" data-shortname=":-)" /><img class="smilie smilie--emoji" loading="lazy" alt="👀" title="Eyes&nbsp; &nbsp; :eyes:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f440.png" data-shortname=":eyes:" />Objectives<ul>
<li data-xf-list-type="ul">Extend the functionali of the the calculator to save and display the past results of the arithmetic operations</li>
</ul>Save and display calculation history of the calculatorIn this second stage of the assignment you will extend the given calculator program to record the calculations, and recall them as a list using an additional command '?'.Task 1: Study the given code in the answer box and extend it to save each executed operation in a Python List.<ul>
<li data-xf-list-type="ul">Declare a list to store the previous operations</li>
<li data-xf-list-type="ul">Save the operator, operands and the results as a single string, for each operation after each calculation</li>
</ul>Task 2: implement a history() function to handle the operation '?'<ul>
<li data-xf-list-type="ul">Display the complete saved list of operations (in the order of execution) using a new command ‘?’</li>
<li data-xf-list-type="ul">If there are no previous calculations when the history '?' command is used, you can display the following message&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &quot;No past calculations to show&quot;</li>
</ul>[CODE=python]def add(a,b):&nbsp; return a+b&nbsp;def subtract(a,b):&nbsp; return a-b&nbsp;def multiply (a,b):&nbsp; return a*bdef divide(a,b):&nbsp; try:&nbsp; &nbsp; return a/b&nbsp; except Exception as e:&nbsp; &nbsp; print(e)def power(a,b):&nbsp; return a**b&nbsp;def remainder(a,b):&nbsp; return a%b&nbsp;def select_op(choice):&nbsp; if (choice == '#'):&nbsp; &nbsp; return -1&nbsp; elif (choice == '$'):&nbsp; &nbsp; return 0&nbsp; elif (choice in ('+','-','*','/','^','%')):&nbsp; &nbsp; while (True):&nbsp; &nbsp; &nbsp; num1s = str(input(&quot;Enter first number: &quot;))&nbsp; &nbsp; &nbsp; print(num1s)&nbsp; &nbsp; &nbsp; if num1s.endswith('$'):&nbsp; &nbsp; &nbsp; &nbsp; return 0&nbsp; &nbsp; &nbsp; if num1s.endswith('#'):&nbsp; &nbsp; &nbsp; &nbsp; return -1&nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; try:&nbsp; &nbsp; &nbsp; &nbsp; num1 = float(num1s)&nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp; &nbsp; except:&nbsp; &nbsp; &nbsp; &nbsp; print(&quot;Not a valid number,please enter again&quot;)&nbsp; &nbsp; &nbsp; &nbsp; continue&nbsp;&nbsp; &nbsp; &nbsp; while (True):&nbsp; &nbsp; &nbsp; num2s = str(input(&quot;Enter second number: &quot;))&nbsp; &nbsp; &nbsp; print(num2s)&nbsp; &nbsp; &nbsp; if num2s.endswith('$'):&nbsp; &nbsp; &nbsp; &nbsp; return 0&nbsp; &nbsp; &nbsp; if num2s.endswith('#'):&nbsp; &nbsp; &nbsp; &nbsp; return -1&nbsp; &nbsp; &nbsp; try:&nbsp; &nbsp; &nbsp; &nbsp; num2 = float(num2s)&nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp; &nbsp; except:&nbsp; &nbsp; &nbsp; &nbsp; print(&quot;Not a valid number,please enter again&quot;)&nbsp; &nbsp; &nbsp; &nbsp; continue&nbsp;&nbsp; &nbsp; &nbsp; result = 0.0&nbsp; &nbsp; last_calculation = &quot;&quot;&nbsp; &nbsp; if choice == '+':&nbsp; &nbsp; &nbsp; result = add(num1, num2)&nbsp; &nbsp; elif choice == '-':&nbsp; &nbsp; &nbsp; result = subtract(num1, num2)&nbsp; &nbsp; elif choice == '*':&nbsp; &nbsp; &nbsp; result = multiply(num1, num2)&nbsp; &nbsp; elif choice == '/':&nbsp; &nbsp; &nbsp; result =&nbsp; divide(num1, num2)&nbsp; &nbsp; elif choice == '^':&nbsp; &nbsp; &nbsp; result = power(num1, num2)&nbsp; &nbsp; elif choice == '%':&nbsp; &nbsp; &nbsp; result = remainder(num1, num2)&nbsp; &nbsp; else:&nbsp; &nbsp; &nbsp; print(&quot;Something Went Wrong&quot;)&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; last_calculation =&nbsp; &quot;{0} {1} {2} = {3}&quot;.format(num1, choice, num2, result)&nbsp; &nbsp; print(last_calculation )&nbsp;&nbsp; &nbsp; else:&nbsp; &nbsp; print(&quot;Unrecognized operation&quot;)&nbsp;&nbsp; while True:&nbsp; print(&quot;Select operation.&quot;)&nbsp; print(&quot;1.Add&nbsp; &nbsp; &nbsp; : + &quot;)&nbsp; print(&quot;2.Subtract : - &quot;)&nbsp; print(&quot;3.Multiply : * &quot;)&nbsp; print(&quot;4.Divide&nbsp;&nbsp; : / &quot;)&nbsp; print(&quot;5.Power&nbsp; &nbsp; : ^ &quot;)&nbsp; print(&quot;6.Remainder: % &quot;)&nbsp; print(&quot;7.Terminate: # &quot;)&nbsp; print(&quot;8.Reset&nbsp; &nbsp; : $ &quot;)&nbsp; print(&quot;8.History&nbsp; : ? &quot;)&nbsp;&nbsp; # take input from the user&nbsp; choice = input(&quot;Enter choice(+,-,*,/,^,%,#,$,?): &quot;)&nbsp; print(choice)&nbsp; if(select_op(choice) == -1):&nbsp; &nbsp; #program ends here&nbsp; &nbsp; print(&quot;Done. Terminating&quot;)&nbsp; &nbsp; exit()[/CODE]history කියලා List Define කරලා result ekata append කරා නම් හරි කියලා හිතලා try&nbsp; කරලා බැලුවා හරි ගියේ නැහැ.<img src="/styles/default/xenforo/smilies/default/sad.gif"&nbsp; class="smilie" loading="lazy" alt=":(" title="Sad&nbsp; &nbsp; :(" data-shortname=":(" /><img src="/styles/default/xenforo/smilies/default/sorry.gif"&nbsp; class="smilie" loading="lazy" alt=":sorry:" title="Sorry&nbsp; &nbsp; :sorry:" data-shortname=":sorry:" /></blockquote>

[QUOTE="SL MULTIMEDIA TUTORIAL, post: 27465798, member: 575597"] meka karaganna Code eka kohomada wenas karanna one :-)👀 [B]Objectives[/B] [LIST] [*]Extend the functionali of the the calculator to save and display the past results of the arithmetic operations [/LIST] [B]Save and display calculation history of the calculator[/B] In this second stage of the assignment you will extend the given calculator program to record the calculations, and recall them as a list using an additional command '?'. [B]Task 1: [/B]Study the given code in the answer box and extend it to save each executed operation in a Python List. [LIST] [*]Declare a list to store the previous operations [*]Save the operator, operands and the results as a single string, for each operation after each calculation [/LIST] [B]Task 2: [/B]implement a history() function to handle the operation '?' [LIST] [*]Display the complete saved list of operations (in the order of execution) using a new command ‘?’ [*]If there are no previous calculations when the history '?' command is used, you can display the following message "No past calculations to show" [/LIST] [CODE=python]def add(a,b): return a+b def subtract(a,b): return a-b def multiply (a,b): return a*b def divide(a,b): try: return a/b except Exception as e: print(e) def power(a,b): return a**b def remainder(a,b): return a%b def select_op(choice): if (choice == '#'): return -1 elif (choice == '$'): return 0 elif (choice in ('+','-','*','/','^','%')): while (True): num1s = str(input("Enter first number: ")) print(num1s) if num1s.endswith('$'): return 0 if num1s.endswith('#'): return -1 try: num1 = float(num1s) break except: print("Not a valid number,please enter again") continue while (True): num2s = str(input("Enter second number: ")) print(num2s) if num2s.endswith('$'): return 0 if num2s.endswith('#'): return -1 try: num2 = float(num2s) break except: print("Not a valid number,please enter again") continue result = 0.0 last_calculation = "" if choice == '+': result = add(num1, num2) elif choice == '-': result = subtract(num1, num2) elif choice == '*': result = multiply(num1, num2) elif choice == '/': result = divide(num1, num2) elif choice == '^': result = power(num1, num2) elif choice == '%': result = remainder(num1, num2) else: print("Something Went Wrong") last_calculation = "{0} {1} {2} = {3}".format(num1, choice, num2, result) print(last_calculation ) else: print("Unrecognized operation") while True: print("Select operation.") print("1.Add : + ") print("2.Subtract : - ") print("3.Multiply : * ") print("4.Divide : / ") print("5.Power : ^ ") print("6.Remainder: % ") print("7.Terminate: # ") print("8.Reset : $ ") print("8.History : ? ") # take input from the user choice = input("Enter choice(+,-,*,/,^,%,#,$,?): ") print(choice) if(select_op(choice) == -1): #program ends here print("Done. Terminating") exit()[/CODE] history කියලා List Define කරලා result ekata append කරා නම් හරි කියලා හිතලා try කරලා බැලුවා හරි ගියේ නැහැ.:(:sorry: [/QUOTE]

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