erlang 数值计算

7.12 Arithmetic Expressions

op Expr
Expr1 op Expr2
op Description Argument type
+ unary + number
- unary - number
+ number
- number
* number
/ floating point division number
bnot unary bitwise not integer
div integer division integer
rem integer remainder of X/Y integer
band bitwise and integer
bor bitwise or integer
bxor arithmetic bitwise xor integer
bsl arithmetic bitshift left integer
bsr bitshift right integer
Table 7.2: Arithmetic Operators.