为什么我不能将余数分配给新变量？？？ 爪哇

Question

    int d = year%100;
    int c = year/100;
    int valueA = (int)(((13*monthnumber)-1)/5);
    int valueB = (int) d/4;
    int valueC = (int) c/4;

    int weekDay = (d + valueA + d + valueB + valueC - 2*c);

    int remainder %= weekDay/7; 

im trying to use the modulus assignment operator but keep getting a system error saying that an '=' was expected instead of '%='

code in question is the last line

please help

Answer 1

int remainder %= weekDay/7; 

would be equivalent to

int remainder = remainder % weekDay/7; 

which makes no sense since you just declared remainder , so it has no previous value.

Had you declared the remainder variable earlier, this would work :

remainder %= weekDay/7; 

Answer 2

%= can't be used for variables that haven't had a value assigned yet.

var %= {value};

is equivalent to

var = var % {value};

But in the way you're using it, remainder hasn't had a value assigned to it yet. So it makes no sense.

Answer 3

因为使用int remainder您需要声明一个变量，并且无法使用%=来实现其初始化

Answer 4

您可能只是想这样做：

int remainder = weekDay % 7;