求算數學 1 + 1/2 + ... + 1/n = ?
double sum = 0;
int n = 2;
for (int i=1; i<=n; i++)
{
sum += 1 / i;
}
Console.WriteLine(sum);
當n趨近無限大，答案應該為2，先不論之
當n=2時，應該有明確值為1.5，但以上程式卻只顯示1
Why?
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