2.转换按数据长度增加的方向进行，以保证精度不降低。例如int型和long型运算时，先把int量转成long型后...
aThe eight primitive data types are: byte, short, int, long, float, double, boolean, and char. The java.lang.String class represents character strings. The compiler will assign a reasonable default value for fields of the above types; for local variables, a default value is never assigned....