Original
Value typecasts
In a value typecast, the type
identifier and the cast expression must both be ordinal types or both be
pointer types. Examples of value typecasts include
Integer('A')
Char(48)
Boolean(0)
Color(2)
Longint(@Buffer)
The resulting value is obtained by
converting the expression in parentheses. This may involve truncation or
extension if the size of the specified type differs from that of the
expression. The expression’s sign is always preserved.
The statement
I := Integer('A');
assigns the value of Integer('A'), that is,
65 to the variable I.
A value typecast cannot be followed by qualifiers and cannot appear on the left side of an assignment statement.
See also
译文
值类型转换
在值类型转换中，类型标识符和被转换的表达式必须都是序数类型或都是指针类型。下面是值类型转换的范例：
Integer('A')
Char(48)
Boolean(0)
Color(2)
Longint(@Buffer)
返回值是通过圆括号中的表达式得到的。这可能涉及根据指定的类型（不同于表达式的值的类型）对表达式的值截断或扩充。表达式的符号总是被保持。
语句
I := Integer('A');
将Integer('A')的值赋给变量
I ，也就是说，将65赋给变量
I 。
值类型转换不能跟随在限定词之后，也不能出现在赋值语句的左边。