Mam problem ze zrozumieniem tego zadania. POMOCY

Pytania dotyczące zadania

Dyskutowane

Metoda min(a, b, c, d) musi używać metody min(a, b). Ten punkt psuje mi zaliczenia zadania gdzie jest błąd albo gdzie jest czegoś za mało?

Napisz funkcję, która wybiera najmniejszą z czterech liczb.
Funkcja min(a, b, c, d) powinna używać (wywoływać) funkcji min(a, b)

Wskazówka:
Musisz napisać ciało dwóch istniejących funkcji min.

Wymagania:

Program powinien wyświetlać tekst na ekranie.
Metody min nie powinny wyświetlać tekstu na ekranie.
Metoda main powinna wywoływać min(a, b) i min(a, b, c, d).
Metoda main powinna wyświetlać wynik działania metod min. Za każdym razem w nowej linii.
Metoda min(a, b) musi zwracać mniejszą z liczb a i b.
Metoda min(a, b, c, d) musi używać metody min(a, b).
Metoda min(a, b, c, d) musi zwracać najmniejszą z liczb a, b, c i d.

package pl.codegym.task.task02.task0217; /* Najmniejsza z czterech liczb */ public class Solution { public static int min(int a, int b, int c, int d) { int m1 = a < b ? a : b; int m2 = m1 < c ? m1 : c; int m3 = m2 < d ? m2 : d; return m3;//tutaj wpisz swój kod } public static int min(int a, int b) { int m2; if (a < b) m2 = a; else m2 = b; return m2; //tutaj wpisz swój kod } public static void main(String[] args) throws Exception { System.out.println(min(-20, -10)); System.out.println(min(-20, -10, -30, -40)); System.out.println(min(-20, -10, -30, 40)); System.out.println(min(-40, -10, -30, 40)); } }

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Guadalupe Gagnon

Poziom 37 , Tampa, United States

25 lipca 2023, 13:42

What are you having trouble with? The task simply wants you to use the min() method with 2 parameters as part of the algorithm in the min() method with 4 parameters. I'm guessing that you may not know how to use methods. Here is some information about methods to cover the basics: When you declare a method in code 4 things are needed: - access level (public, private, protected) - return value - method name - method parameters ***technically the access level in not strictly needed. If you don't put an access level then one is added by default that is similar to the protected access level*** When a return value is specified all code paths in that method must return a valid value matching that return type, or throw an Exception. If the method is not supposed to return a value then you still need to specify that by using 'void' as its return value. In the Solution class from the above code there are 3 methods: line 8: a min() method with 4 int parameters that is publicly accessible, static, and returns an int. Because the return type specified is int, the algorithm in this method MUST return an int. line 16: a second min() method with 2 int paramenters that is publicly accessible, static, and returns an int. Because the return type specified is int, the algorithm in this method MUST return an int. line 28: a main() method with 1 String[] parameter that is also publicly accessible, static, and returns nothing. Because the return type specified is void this method requires not return.

Guadalupe Gagnon

Poziom 37 , Tampa, United States

25 lipca 2023, 13:51

to use a method you simply just need to call it by using its name and passing the proper arguments that match the method's parameters surrounded by parentheses, and viola. You have 8 examples of methods being used in the code above: line 29: System.out.println() method is called. This method's parameters are vast but simply can accepts nearly everything and will display what is passed to the console's output. On line 29 this method is being passed another method, the min() method with 2 parameters. The println() method does not print "min(-20, -10)", it prints the return value that is the result of the algorithm from that min() method.... in this case -20. You could change the numbers to any two numbers you want and what will be printed is the minimum of those two numbers. line 30: another Sys.o.pl() method but his time it is printing the result of the call to the min() method with 4 variables. On this line the arguments that are passed to it are (-20, -10, -30, -40) which the method returns the minimum of those arguments and that is what is printed to the console. Once again, you can change the arguments being passed and arrive at a different result, which according to the coded algorithm will be the minimum of the four numbers. lines 31 and 32 are the same as 30, but with different arguments to the min() method.

Guadalupe Gagnon

Poziom 37 , Tampa, United States

25 lipca 2023, 14:01

przydatny

and finally, as a simple example:

static int multiplyByTwo(int num) {
   return num * 2;
}

public static void main(String[] args) {
   int test = multiplyByTwo(5);
   int test2 = multiplyByTwo(test);

   System.out.println("Value of test: " + test);
   System.out.println("Value or test2: " + test2);
}

Consider this code. I created a method called multiplyByTwo that returns an int and has 1 int parameter.

.......↓1        ↓2        ↓3
static int multiplyByTwo(int num)

// 1: return typle
// 2: name
// 3: parameter(s)

In the main method I use this method to set test variables. The first, test, I set to the value returned my the method when I pass it the value 5 as an argument. The second, test2, is set to the value returned when I pass the test variable as an argument. When you run the code you will see the outputs showing that test is equal to 10 and test2 is equal to 20.

Maciej

Poziom 3 , Poland, Poland

25 lipca 2023, 14:25

Thank you for your responding. I'm starting from 0 with Java or any programing things so i have problem with understanding all this stuff and terminology. Before you answer my question i found solution and in line 9 i make change it was: int m1 = a < b ? a : b; and I changed to: m1 = min(a, b); And all task was good.

Guadalupe Gagnon

Poziom 37 , Tampa, United States

25 lipca 2023, 15:13

Good Job! Learning to program is the most difficult when you first start. It takes a lot of persistence to keep it up for the first few months to a year. As you practice more and more the concepts all start coming together and will make sense. If you don't have a Java book to supplement your learning on codegym then I would recommend getting one. I used "Thinkin in Java" but have heard that "Headfirst Java" is also a good book. I don't know what is available in Polish, though I am sure google could help with suggestions.

Maciej

Poziom 3 , Poland, Poland

25 lipca 2023, 16:37

Thank you for advice i will do resarch about books with Java and also i will look at this two books from your advice.