设x=2.5,a=7,y=4.7,求x+a%3*(int)(x+y)%2/4 要说明先算哪步.最好再说说运算符的优先级.

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设x=2.5,a=7,y=4.7,求x+a%3*(int)(x+y)%2/4 要说明先算哪步.最好再说说运算符的优先级.
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设x=2.5,a=7,y=4.7,求x+a%3*(int)(x+y)%2/4 要说明先算哪步.最好再说说运算符的优先级.
设x=2.5,a=7,y=4.7,求x+a%3*(int)(x+y)%2/4 要说明先算哪步.最好再说说运算符的优先级.

设x=2.5,a=7,y=4.7,求x+a%3*(int)(x+y)%2/4 要说明先算哪步.最好再说说运算符的优先级.
x+a%3*(int)(x+y)%2/4 //先算(int)(x+y),x+y取整得7
=x+a%3*7%2/4 //算a%3=1
=x+1*7%2/4 //算1*7=7
=x+7%2/4 //算7%2=1
=x+1/4 //算1/4=0
=x+0
=2.5

先算 (int)(x+y) = 7；再算3*(int)(x+y)和2/4 ，分别等于21，0（3*7，2除4取整为0）；再算7%21%0，等于0；最后算x+0,等于2.5。

先把未知数代入
2.5+7%*3*int(2.5+7)%*2/4
=2.5+7%*3*9%*2/4
=2.5+7%*3*9%/2
=2.5+63*3/2/10000
=2.5+189/2/10000
=2.5+0.00945
=2.50945

算术运算符是按左结合性运算的，即从左到右，强制类型转换优先级高于求余运算。
1. a%3=1
2. (int)(x+y)=7
3. 1*7=7
4. 7%2=1
5. 1/4=0
6. X+0=2.5

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