Computer Programming with GNU Smalltalk - Free
Computer Programming with GNU Smalltalk - Free
Computer Programming with GNU Smalltalk - Free
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98 <strong>Computer</strong> <strong>Programming</strong> <strong>with</strong> <strong>GNU</strong> <strong>Smalltalk</strong><br />
9.<br />
Chapter 5<br />
"answer_4_8.st"<br />
| newNumber howManyNumbers sum arithmeticAverage |<br />
newNumber := 0.<br />
howManyNumbers := 0.<br />
sum := 0.<br />
arithmeticAverage := 0.<br />
[newNumber = 'finish'] whileFalse: [<br />
Transcript show: 'Arithmetic averages of the numbers so far is: ',<br />
arithmeticAverage printString; cr.<br />
].<br />
Transcript show: 'Please enter a new number or "finish" to exit '.<br />
newNumber := stdin nextLine.<br />
(newNumber isNumeric) ifTrue: [<br />
sum := sum + newNumber asInteger.<br />
howManyNumbers := howManyNumbers + 1.<br />
arithmeticAverage := sum / howManyNumbers.<br />
].<br />
Transcript cr.<br />
Arithmetic averages of the numbers so far is: 0<br />
Please enter a new number or "finish" to exit: 2<br />
Arithmetic averages of the numbers so far is: 2<br />
Please enter a new number or "finish" to exit: 4<br />
Arithmetic averages of the numbers so far is: 3<br />
Please enter a new number or "finish" to exit: finish<br />
1 to: 1000 do: [:x | x printNl].<br />
1<br />
...<br />
1000<br />
1<br />
1. Polymorphism is the name of the concept to determine which method to execute according to the<br />
type of the class of the object we sent the message.<br />
Observing the attributes and behavior of the ancestor class when deriving a new class from it is
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