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pow()函式在C99的定義是
{% highlight cpp %}
double pow (double base, double exponent);
float powf (float base, float exponent);
long double powl (long double base, long double exponent);
{% endhighlight %}
所以,使用pow()時引入的參數必須是float,double,long double這三種型態才不會出現多載問題