Parameters and Function

[paulo cs]

These parameters are giving error. Why? The parameters: a,b and c.

public class Bascara {
	int calc(int  a, b, c){
    	return ((b*b)-4*a*c);
    }
	public static void main(String[] args) {
		Bascara calcula = new Bascara();
		System.out.println(calcula.calc(5, 8, 9));
	}

}

This is message error:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method calc(int) in the type Bascara is not applicable for the arguments (int, int, int)

at Bascara.main(Bascara.java:15)

[Christophe Verré]

int calc(int  a, b, c){  

Try to search how to declare method arguments in Java.

[Guilherme Borges Lima]

You must define the types of all arguments of your methods

int calc(int  a, b, c){

a = int
b = ?
c = ?

try this:

public class Bascara {   
    int calc(int  a, int b, int c){   
        return ((b*b)-4*a*c);   
    }   
    public static void main(String[] args) {   
        Bascara calcula = new Bascara();   
        System.out.println(calcula.calc(5, 8, 9));   
    }   
  
}  

[Christophe Verré]

Guilherme, welcome to the ranch
You should have a look at this FAQ to help other ranchers more efficiently.

[Rob Spoor]

Paulo, may I suggest you do some reading first? You said in another thread you recently started Java after using Delphi before that, so you probably understand the basics but not the syntax and Java specifics.

The Java Tutorial and/or books like Head First Java are real great to start with.

[Campbell Ritchie]

We don't usually give out straight answers to things people can look up for themselves, but I believe here it is right to give you the answer. Guilherme Borges Lima has shown you the correct version.

As you obviously already know, one has to give a type for each variable, field, parameter, etc. For parameters, you cannot give one type to two parameters.

public void foo(int a, b, c) . . . // Syntax error

public void foo(int a, int b, int c) . . . // Correct syntax.

[Rob Spoor]

Paulo's syntax comes from Delphi / Pascal, where you only specify the type when it changes. So the following are all Delphi / Java pairs:

Procedure foo(int a, b, c); // Delphi
void foo(int a, int b, int c) // Java

Function bar(String s1, s2; int a, b; String s3): String; // Delphi
String bar(String s1, String s2, int a, int b, String s3) // Java

[Campbell Ritchie]

That syntax looks like Eiffel syntax, which I am sure is copied almost unchanged from Pascal syntax.