C++ 尽量使用 static_cast 强制类型转换

#include <iostream>

int main()
{
    using namespace std;

    int totalCandy, numberOfPeople;
    double candyPerPerson;

    totalCandy = 9;
    numberOfPeople = 2;

    candyPerPerson = totalCandy / numberOfPeople;
    cout << "未经转换的结果：" << candyPerPerson << endl;

    // C++ 尽量使用这种强制转换方式
    candyPerPerson = static_cast<double>(totalCandy) / numberOfPeople;
    cout << "强制转换的结果：" << candyPerPerson << endl;

    candyPerPerson = double(totalCandy) / numberOfPeople; // 古老的方式，或者 (double)totalCandy
    cout << "强制转换的结果：" << candyPerPerson << endl;

    return 0;
}

输出：

未经转换的结果：4
强制转换的结果：4.5
强制转换的结果：4.5