| a b stdout |
stdout := FileStream stdout.
FileStream stdin
   linesDo: [ :line |
     line isEmpty ifFalse: [
        (a isNil)
            ifTrue: [ a := line asNumber ]
            ifFalse: [ b := line asNumber ]
     ]
  ].
stdout nextPutAll: '和: '; nextPutAll: (a + b) printString; nl;
       nextPutAll: '差: '; nextPutAll: (a - b) printString; nl;
       nextPutAll: '積: '; nextPutAll: (a * b) printString; nl.
b = 0
   ifTrue: [
        stdout nextPutAll: 'ゼロで割ろうとしています'; nl
   ]
   ifFalse: [
        stdout nextPutAll: '商: '; nextPutAll: (a / b) printString; nl.
               nextPutAll: '余剰: '; nextPutAll: (a \\ b) printString; nl.
   ].
stdout flush.
 

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