static_cast

static_cast<type> (object);

The static_cast operator can be used for operations such as:

• Converting a pointer of a base class to a pointer of a derived class,
• Convert numeric data types such as enums to ints or ints to floats.

示例

int score = 1340;

float scale = static_cast<float>(score) / MAX_SCORE + 1;

// 如果这样呢？会有什么不同
float scale = score / MAX_SCORE + 1;

需要注意的是，在基础类型转换时，并非进行四舍五入，而是直接舍去小数部分！