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Increament operator error

Sat, 18 Aug 2012 02:16:12 -0700

i started learning JAVA a few days back.
i thought of writing my first program on arithmetic operators.
but i m getting compilation error with the "++" operator.
below is my code.

public class IntArithmeticOperations {
       public static void main(String args[]){
	 System.out.println("Arithmetic Operations Sample");
	 
	 int i=10;
	 
	 int increamentResult=++i;//This is ok
	 int increamentResult1=++(i);//This is also ok
	 int increamentResult2=doit(++i);  //This is also ok
	 int increamentResult3=++(++i);   //This gives a compilation
error
	 int increamentResult4=++(i=i++); //This gives a compilation error
	 int increamentResult5=++(i+1); //This gives a compilation error
	 
	 System.out.println("IncreamentResult is"+increamentResult);
	 System.out.println("IncreamentResult1 is"+increamentResult1);
	 System.out.println("IncreamentResult2 is"+increamentResult2);
	 System.out.println("IncreamentResult3 is"+increamentResult3);
	 System.out.println("IncreamentResult4 is"+increamentResult4);
	 System.out.println("IncreamentResult5 is"+increamentResult5);
    }
 public static int doit(int i){
	 return i;
 }
}

Please help me understand how the "++" operator works.

Re: Increament operator error

Thu, 23 Aug 2012 02:55:58 -0700

public class IntArithmeticOperations {
public static void main(String args[]){
System.out.println("Arithmetic Operations Sample");

int i=10; You have initialized the code which is good

int increamentResult=++i;//This is ok
this is saying add 1 which increments the value i to 11

int increamentResult1=++(i);//This is also ok
the brackets doesn't matter in this one its the same as before but you're adding 1 again which makes the value 12

int increamentResult2=doit(++i); //This is also ok
this is calling the doit method (which just goes down to see if there's anything in the method doit. You've only returned i so it comes back to this statement and increments it...so now its 13.

int increamentResult3=++(++i); //This gives a compilation
error

this is causing an error because it wants a variable. You're not calling any methods and you can't just put ++ and (++i). make these statements in different lines
e.g
int increamentResult3=i++;
int incrementResult4 = doits(++i);

int increamentResult4=++(i=i++); //This gives a compilation error
int increamentResult5=i++;

//make another method

int incrementResult5 = doits(i=i++);

int increamentResult5=++(i+1); //This gives a compilation error

System.out.println("IncreamentResult is"+increamentResult);
System.out.println("IncreamentResult1 is"+increamentResult1);
System.out.println("IncreamentResult2 is"+increamentResult2);
System.out.println("IncreamentResult3 is"+increamentResult3);
System.out.println("IncreamentResult4 is"+increamentResult4);
System.out.println("IncreamentResult5 is"+increamentResult5);
}
public static int doit(int i){
return i;
}
}
hope i didn't confuse you too much :) i'm new to java too

Re: Increament operator error

Thu, 23 Aug 2012 02:58:16 -0700

Re: Increament operator error

Thu, 23 Aug 2012 03:00:07 -0700