Why cant I assign a remainder to a new variable??? JAVA

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

Because `%=` is invalid. You can only assign variables with "=". You're looking for `int remainder = weekDay % 7;` — CubeJockey, Sep 22 '15 at 19:34
Do you mean `int remainder = weekDay%7;` ? If not, what do you mean? — khelwood, Sep 22 '15 at 19:35
possible duplicate of [What's the syntax for mod in java](http://stackoverflow.com/questions/90238/whats-the-syntax-for-mod-in-java) — sstan, Sep 22 '15 at 19:38
To use an operator like this, the variable has to have had a previous declaration, and a previous value. — Peter Lawrey, Sep 22 '15 at 19:39

score 2 · Answer 1 · answered Sep 22 '15 at 19:35

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;

score 2 · Answer 2 · answered Sep 22 '15 at 19:35

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.

answered Sep 22 '15 at 19:35

Xirema

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score 1 · Answer 3 · answered Sep 22 '15 at 19:34

1

because with int remainder you are declaring a variable, and its initialisation cannot be achieved with %=

answered Sep 22 '15 at 19:34

gefei

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score 1 · Accepted Answer · answered Sep 22 '15 at 19:36

1

You probably just meant to do this:

int remainder = weekDay % 7;

answered Sep 22 '15 at 19:36

sstan

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Why cant I assign a remainder to a new variable??? JAVA

4 Answers4