[JAVA] basic debugging

[huracan]

Hey im learning java and ive been given a task to debug a code and ive been able to debug it for all of it except for 2 errors and im unable to understand them. please help me understand them.

public class Debug5{
   public static void main(String[] args){
	int a = 0, b = 0;
	while(sum < 100){
		addNums(a,b);
		System.out.println(sum);
		b += 5;
		a++;
	}//end while loop
}//end main	

public static void addNums(a, b){ //THIS IS LINE 20
	int a, b;
	int sum = a + b;
	return  sum;
}//end add nums
   
}

HERE are the errors

Debug5.java:20: error: <identifier> expected
public static void addNums(a, b){
                            ^
Debug5.java:20: error: <identifier> expected
public static void addNums(a, b){

 

[NoRomanBatmansAllowed]

Go over to /r/JavaHelp for a lot more (and usually a lot quicker) people who help.

 

So what you're doing in line 20 is you're defining a method. A method has 2 arguments. The thing with methods in Java, unlike pleb languages like python or JS, is that you need to set the type of variable you'd input. So in this case:

 

public static void addNums(int a, int b){

 

and you would not redefine the variables after it.

 

You don't have to assign the result to an int either, so a cut down version of this would be

public static void addNums(int a, int b){
	return a+b;
}

 

[Unimaginative Name]

When creating a method, you need to identify the datatype of your parameters.

public static void addNums(int a, int b){

 

[huracan]

Just now, Pangea2017 said:

public static void addNums(int a, b){

but i have already declared it inside the program, should i declare it in the parentheses as well ?

 

[huracan]

1 minute ago, bob51zhang said:

Go over to /r/JavaHelp for a lot more (and usually a lot quicker) people who help.

 

So what you're doing in line 20 is you're defining a method. A method has 2 arguments. The thing with methods in Java, unlike pleb languages like python or JS, is that you need to set the type of variable you'd input. So in this case:

 

public static void addNums(int a, int b){

gee thanks for the suggestion on  r/reddit

[NoRomanBatmansAllowed]

Just now, huracan said:

 

You should read up on Java variable scopes.

 

https://www.geeksforgeeks.org/variable-scope-in-java/