這是用" while ( total < 1.00000001 ) " 的結果：
...
counter=97
total=0.97999936342239380000000000000000
counter=98
total=0.98999935388565063000000000000000
counter=99
total=0.99999934434890747000000000000000
counter=100
total=1.00999939441680910000000000000000
counter=101
???:101Press any key to continue . . .
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還真沒想過這問題，多謝樓主提醒，賺了一次經驗∼