多选题Which of the following statements are legal？（）Along l = 4990；Bint i = 4L；Cfloat f = 1.1；Ddouble d = 34.4；Edouble t = 0.9F；
多选题
Which of the following statements are legal？（）
A
long l = 4990；
B
int i = 4L；
C
float f = 1.1；
D
double d = 34.4；
E
double t = 0.9F；
参考解析
解析：
此题的考点是数字的表示法和基本数据类型的类型自动转换，没有小数点的数字被认为是int型数，带有小数点的数被认为是double型的数，其它的使用在数字后面加一个字母表示数据类型，加l或者L是long型，加d或者D是double，加f或者F是float，可以将低精度的数字赋值给高精度的变量，反之则需要进行强制类型转换，例如将int,short,byte赋值给long型时不需要显式的类型转换，反之，将long型数赋值给byte,short,int型时需要强制转换（int a=(int)123L;）。
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