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Arithmetic operators
Arithmetic
operators, which take real or integer operands, include +, -, *,
/, div, and mod.
Operator |
Operation |
Operand types |
Result type |
Example |
|
+ |
addition |
integer, real |
integer, real |
X + Y |
|
- |
subtraction |
integer, real |
integer, real |
Result - 1 |
|
* |
multiplication |
integer, real |
integer, real |
P * InterestRate |
|
/ |
real division |
integer, real |
real |
X / 2 |
|
div |
integer division |
integer |
integer |
Total div UnitSize |
|
mod |
remainder |
integer |
integer |
Y mod 6 |
Operator
|
Operation |
Operand types |
Result type |
Example |
|
+(unary) |
sign identity |
integer, real |
integer, real |
+7 |
|
-(unary) |
sign negation |
integer, real |
integer, real |
-X |
The following rules apply to
arithmetic operators.
· The value of x/y is of type Extended, regardless of
the types of x and y. For other arithmetic operators, the result is of
type Extended whenever at least one operand is a real; otherwise, the
result is of type Int64 when at least one operand is of type Int64;
otherwise, the result is of type Integer. If an operand’s type is a
subrange of an integer type, it is treated as if it were of the integer type.
· The value of x div y is the value of x/y
rounded in the direction of zero to the nearest integer.
· The mod operator returns the remainder obtained by dividing
its operands. In other words, x mod y = x - (x
div y) * y.
· A runtime error occurs when y is zero in an expression of the form x/y, x div y, or x mod y.
Topic groups
See also
译文
算术运算符
算术运算符接受实数或整数作为操作数。算术运算符包括+, -, *, /, div, mod。
运算符 |
操作 |
操作数 |
结果类型 |
范例 |
|
+ |
加 |
整数，实数 |
整数，实数 |
X + Y |
|
- |
减 |
整数，实数 |
整数，实数 |
Result - 1 |
|
* |
乘 |
整数，实数 |
整数，实数 |
P * InterestRate |
|
/ |
实数除 |
整数，实数 |
实数 |
X / 2 |
|
div |
整数除 |
整数 |
整数 |
Total div UnitSize |
|
mod |
取模 |
整数 |
整数 |
Y mod 6 |
运算符
|
操作 |
操作数 |
结果类型 |
范例 |
|
+(一元) |
符号等同 |
整数，实数 |
整数，实数 |
+7 |
|
-(一元) |
符号相反 |
整数，实数 |
整数，实数 |
-X |
下列规则对算术运算符试用：
· 表达式 x/y 的值始终是Extended类型，而不管 x 和 y 是何类型。对于其他算术运算符，只要至少其中一个操作数是实数，其运算结果就是Extended类型；否则，其中一个操作数是Int64类型，其运算结果是Int64类型；否则运算结果是Integer类型。如果一个操作数的类型是整数类型的子界，那么它将被视为整数类型。
· 表达式 x div y 的值是表达式
x/y 的值向零取整（即从该值到零方向的第一个整数）。
· mod 运算符返回操作数整除的余数。也就是说，x mod y = x - (x
div y) * y。
· 对于表达式x/y、x div y、x mod y，当 y 为零时将发生运行时错误。
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