CODEWITHSUNDEEP
java
john
john

Reputation: 201

how do i change the value that is passed by a method?

so i'm trying to increase the value of that is stored in getDay() by 1 but this method doesn't work. any advice? thanks

if(getDay()<1 || getDay()>31);
        {
        int temp = getDay();
        temp++;
        getDay() = temp;
        }

Upvotes: 1

Views: 78

Answers (3)

Jason
Jason

Reputation: 11832

You can't update the value returned by getDay() this way:

getDay() = temp;  <-- this won't work

Instead, if a setDay() method exists, then you could call that:

setDay(temp);

Or, you need to read the code for the getDay() method and figure out how to set the value in that code.

Edit

So, your code could look like this:

if(getDay()<1 || getDay()>31)
{
    int temp = getDay();
    temp++;
    setDay(temp);
}

Or...

if(getDay()<1 || getDay()>31)
{
    int temp = getDay();
    setDay(++temp);
}

Upvotes: 2

itoctopus
itoctopus

Reputation: 4251

You can't increase the return value of a function by just assigning a value to it. I think you will need to learn more on functions/methods and how they work.

Upvotes: 1

Yesyoor
Yesyoor

Reputation: 166

you are using 

getDay() = temp;

but that means calling the method and setting the returned value to temp ...or so.

try set the initial value to temp which getDay() handles back. You need to find the value being told by getDay() in the class containing that value and access it directly. sorry for my engl

example: your method:

public int getDay(){return day;}

set method:

public void setDay(int dayPassed){
day= dayPassed;

}

in your example:

if(getDay()<1 || getDay()>31);
    {
    int temp = getDay();
    temp++;
    setDay(temp);
    }

Upvotes: 2

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