運(yùn)算符優(yōu)先級(jí)來確定條件的表達(dá)式中的分組。這會(huì)影響一個(gè)表達(dá)式如何計(jì)算。某些運(yùn)算符的優(yōu)先級(jí)高于其他。
試試下面的例子就明白了在Lua編程語言的運(yùn)算符所有的優(yōu)先級(jí):
a = 20 b = 10 c = 15 d = 5 e = (a + b) * c / d;-- ( 30 * 15 ) / 5 print("Value of (a + b) * c / d is :",e ) e = ((a + b) * c) / d; -- (30 * 15 ) / 5 print("Value of ((a + b) * c) / d is :",e ) e = (a + b) * (c / d);-- (30) * (15/5) print("Value of (a + b) * (c / d) is :",e ) e = a + (b * c) / d; -- 20 + (150/5) print("Value of a + (b * c) / d is :",e )
當(dāng)建立并執(zhí)行上面的程序它會(huì)產(chǎn)生以下結(jié)果:
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