Why does it loop infinitely in the println?

Question

Build a program that is able to average all entire or actual arguments received from the keyboard and print them.

Invalid arguments should be disregarded (Print a message for each invalid value. ), without triggering exception display (Display a message to the user asking him to inform again the value).

The user must enter S when they wish to terminate the entry dice;

I switched the S for 5, but it must be S, how do I get to read a char in place? I couldn’t get the logic.

import java.util.Scanner;

public class Media {
    public static void main(String[] args) {
        
        int i = 0;
        float valor = 0;
        float media = 0;
        
        Scanner v = new Scanner(System.in);
        valor = v.nextFloat();
        
        while(valor != 5){
            System.out.println("Insira um valor: ");
            media += valor;
            i++;
        }
        
        media = valor/i;
        System.out.println("Média é: "+ media);
        
    }
}

Answer 1

Like mentioned by Maniero, the variable valor never changes inside the loop, the condition is never satisfied. Update valor at each iteration.

To get a char from the entrance, you can do so:

char caractere = v.next().charAt(0);

Alternatively, you can use Scanner.html#hasNext to run the loop until a condition is met, that the letter be typed S:

int i = 0;
float soma = 0, valor = 0, media = 0;
// ....

try (Scanner scanner = new Scanner(System.in)) { // Libera o recurso após o uso
   while (!scanner.hasNext("S")) { // Corre o loop enquanto não for digitado "S"
       System.out.println("Insira um valor: ");

       // Mais códigos...
       i++;
   }
}

Before picking up the input values, make sure the data you want to get is available with Scanner.html#hasNextFloat:

if (scanner.hasNextFloat()) { // Verifica se a entrada pode ser lido como um float
    valor = scanner.nextFloat();
    soma += valor;
}

Outside the try, you display the result as you are already doing, the other conditions of your exercise, you can easily solve. :)

media = soma / i;