# D語言運算子優先順序

Postfix  () [] -> . ++ - -   Left to right
Unary  + - ! ~ ++ - - (type)* & sizeof  Right to left
Multiplicative   * / %  Left to right
Additive   + -  Left to right
Shift   << >>  Left to right
Relational   < <= > >=  Left to right
Equality   == !=  Left to right
Bitwise AND  Left to right
Bitwise XOR  Left to right
Bitwise OR  Left to right
Logical AND  &&  Left to right
Logical OR  ||  Left to right
Conditional  ?:  Right to left
Assignment  = += -= *= /= %=>>= <<= &= ^= |=  Right to left
Comma  Left to right

## 例子

```import std.stdio;

int main(string[] args)
{
int a = 20;
int b = 10;
int c = 15;
int d = 5;
int e;
e = (a + b) * c / d;      // ( 30 * 15 ) / 5
writefln("Value of (a + b) * c / d is : %d
",  e );
e = ((a + b) * c) / d;    // (30 * 15 ) / 5
writefln("Value of ((a + b) * c) / d is  : %d
" ,  e );
e = (a + b) * (c / d);   // (30) * (15/5)
writefln("Value of (a + b) * (c / d) is  : %d
",  e );
e = a + (b * c) / d;     //  20 + (150/5)
writefln("Value of a + (b * c) / d is  : %d
" ,  e );
return 0;
}```

```Value of (a + b) * c / d is : 90
Value of ((a + b) * c) / d is  : 90
Value of (a + b) * (c / d) is  : 90
Value of a + (b * c) / d is  : 50```