HELPPPP in Java please calculator potencies

Question

Hello,
I have a problem. I’m currently trying to do a simple calculator in java as homework. I’ve made a GUI with JButtons, JLabels and JNumberFields. I added multiplication, division, addition and subtraction to my calculator and it’s working without any problems. Now my task is to add potency calculation to my calculator with a for loop. But I don’t know how to do this. I began to write a code. Can someone help me please?

https://code.sololearn.com/c2a0z7khZ4f1/?ref=app

Answer 1

Pauline 3^4 is 81. It is right.
exponent - 1 means (4-1 = 3). It is the limit of the for loop.
outcome = 1;
--> outcome = outcome * base (the loop have to run 4 times; i from 0 to 3)
outcome = base
--> the loop have to run only 3 times (i from 0 to 2)

Answer 2

2^5 means 2*2*2*2*2 (5 times)
3^2 means 3*3 (2 times)
int base; //5
int exponent; //3
//5^3
int outcome = base; //5
//so you have to multiply outcome * base two times --> limit for your for loop = exponent - 1
for (int i = 0; i < exponent-1; i++){
outcome*= base;
}
i = 0 --> outcome = 25
i = 1 --> outcome = 125 = 5^3

Answer 3

It works:
https://code.sololearn.com/ci0UdhbDEmBF/?ref=app

Answer 4

You can also use math.pow.
Import java.util.Math;
int outcome = (int) Math.pow (base, exponent);

Edit: But you have to use a for loop. But with this method you can check if your for loop works.

Answer 5

Pauline your welcome :)

Answer 6

Okay dann auf deutsch:

Eine for loop Schleife hat einen Startwert, eine Bedingung wie lange sie laufen soll und was mit meinem Startwert passieren soll
For (int i = 0; i < ende; i++)

Angenommen ich habe die Basis 3 und den Exponenten 4;
3*3*3*3
Wenn ich den Ausgangswert von Outcome auf 1 setze, muss ich als Grenze den Exponenten wählen.
For (int i = 0; i < exponent; i++){
Outcome = outcome * base
oder outcome*=base;
}
Wenn ich aber outcome = base wähle, spare ich mir eine Multiplikation. Also ist die Grenze exponent - 1

Answer 7

its not working the outcome if i have 3^4 is 9

Answer 8

ah okey now i understand it thank you 🙏

Answer 9

I’ll try it. Thank you 🤗

Answer 10

its working thank you soooooo much🙏🤗

Answer 11

no the outcome is 81. what does the -1 behind exponent mean

Answer 12

also was macht die -1 hinter dem exponent, für was ist die gut

Answer 13

ja ich habe es verstanden. es funktioniert jetzt alles danke 🤗