C++ basic - numeric type conversation数值类型转换

时间:2014-06-21 10:09:58   收藏:0   阅读:240

What?

在计算中涉及不同数值类型的computation,这时候,C++会按照以下顺序进行转换

order:long double>double>float>unsigned long>long>unsigned int>int

eg. (1) 1/2=0(当1和2都是int时),结果也肯定是int;

  (2)1.0/2=0.5(当1.0为double,2为int时),2会被转化成doubley因为double>int

 

syntax for type convertion:

static_cast<type>(value)

eg. (1)cout<<static_cast<double>(1)/2<<endl

    result: 0.5

  (2)cout<<static_cast<int>(tax*100)/100.0

    effect:keep two digits after the decimal point(保留小数点后两位)

 

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