我有以下两行，找不到很好的解释
我确实读过逗号作为运算符和分隔符的双重性质，以及括号的优先级优先级和逗号作为序列点。
int a =(3,4) // here a is 4 because comma here is an operator first a=3 , then a = 4
int a={3,4} // here is the problem , should not a=3 and then a =4 too because comma is a sequence point or it's undefined behavior or what ?
我期望
a=4
a=4 ,
but the actual output is
a=4 , a=3