frage

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In der Diskussion

was ist hier mein fehler danke

Gib über die Tastatur Zahlen ein.
Wenn der Benutzer -1 eingibt, zeige die Summe aller eingegebenen Zahlen an und beende das Programm.
-1 muss in der Summe enthalten sein.

Tipp: Eine der Lösungen für dieses Problem verwendet das folgende Konstrukt:

while (true) {
    int zahl = Zahl einlesen;
    if (prüfen, ob die Zahl -1 ist)
        break;
}

Anforderungen:

Das Programm muss die Zahlen von der Tastatur einlesen.
Wenn der Benutzer -1 eingibt, muss das Programm die Summe aller eingegebenen Zahlen anzeigen und sich dann beenden.
Das Programm muss die Summe der eingegebenen Zahlen berechnen und anzeigen.
Das Programm muss eine for-Schleife oder eine while-Schleife verwenden.

package de.codegym.task.task04.task0442; /* Addieren */ import java.io.*; public class Solution { public static void main(String[] args) throws Exception { //schreib hier deinen Code BufferedReader r= new BufferedReader(new InputStreamReader(System.in)); int sum; while(true){ String js=r.readLine(); int a=Integer.parseInt(js); String ms=r.readLine(); int b=Integer.parseInt(ms); String ts=r.readLine(); int c=Integer.parseInt(ts); String is=r.readLine(); int d=Integer.parseInt(is); String us=r.readLine(); int e=Integer.parseInt(us); if(a==-1){ sum=b+c+d+e; break; }else if(b==-1){ sum=a+c+d+e; break; }else if(c==-1){ sum=a+b+d+e; break; }else if(d==-1){ sum=a+b+c+e; break; }else if(e==-1){ sum=a+b+c+d; break; } } System.out.println(sum+(-1)); } }

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Gellert Varga

Level 23 , Szekesfehervar, Hungary

8 Mai 2022, 19:40

According to the task description, the user may want to type only two numbers, then type the -1 as the third number, and she/he no longer want to type more numbers, and wonder the sum of these three numbers. In contrast, your program definitely expects us to type a fourth number and a fifth number too. In the "while" loop, it is sufficient to do these once: - to read the line, and - to convert it to a number. You have to have a variable ("sum") to which you immediately add the read number (inside the loop). Check the number read to be equal to minus 1. In this case "break". If the number is not minus 1, the commands written in the loop will be executed again, so user will be asked to type the next line, which will be automatically converted to a number and added to the previous amount, and so on. For such a program, you can type -1 at any time. It could be the second or fifth or thirteenth number, it doesn't matter.

Veysel Sam

Level 7 , Germany, Germany

10 Mai 2022, 19:04

can you show me how you mean it with the code excuse me sometimes it is difficult for me :)

Gellert Varga

Level 23 , Szekesfehervar, Hungary

18 Mai 2022, 18:32

declare a 'sum' variable, give it a value of zero;
declare a 'number' variable, give it a value of zero;

     while (true)
     {
         read a line from consol;
         convert the read line to an int and put it in the 'number' variable;
         if (number == -1)
         {
            in this case, the loop must be break, but first: the 'number' must be added to the 'sum' ;
            // so the 'break' statement interrupts the cycle, immediately exits it, and starts executing the statements written after the loop
         }
         else
         {
            the number must be added to the 'sum'; // and the 'while' loop will start again from the beginning
            // so if the number is not minus 1, the 'while' loop will be executed again (reads a number again, etc.)
         }
     }

print the 'sum' variable;