# Thread: finding the power to a number then the user inputs a max a min power

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## finding the power to a number then the user inputs a max a min power

hi guys ineed some help on a basic program. the user has to input a base and a min and max of powers. from there the program has to determine all the answers including the min and max and has to output them. example: base: 2 min: 1 max: 3 so the answer should be
2 4 8. i have started the code but i dont know where to go from here:
Java Code:
```package numberssquared;
public class Square {
public static void main(String[] args) {
int base;
int minnumber;
int maxnumber;
double squarenumber = 0;
int number;

for(number = minnumber; number <= maxnumber; number ++)
squarenumber = Math.pow(base, number);

System.out.print(squarenumber);

} // end main()
}  // end class```
this will just display the last power so for that exmaple it just answers 8. the for stament does work and when i tested it, it said 1 2 3 which is right. but it doesnt work when its enterd into the math.pow.
Last edited by Norm; 11-20-2011 at 02:46 PM. Reason: Fix indentations  Reply With Quote

2. ## Re: finding the power to a number then the user inputs a max a min power

Check the formatting of your code. It is very important that you align the ending } vertically beneath the start of the statement with the beginning {. Statements within {} should be indented 3-4 spaces.

If you properly indent and align your code you will see what the problem is.  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

umm i dont understand what u are saying. is it a simple } mistake becuase i checked it and there are suppose to be two at the end. but should the loop first terminate and then after that should i write the math.pow statement?  Reply With Quote

4. ## Re: finding the power to a number then the user inputs a max a min power

What do you want your code to print out? Can you copy the command prompt console from when you execute the program and post it here? Add comments to it describing what is wrong with the output and show what you want the output to be.
To copy the contents of the command prompt window:
Click on Icon in upper left corner
Select Edit
Select 'Select All' - The selection will show
Click in upper left again
Select Edit and click 'Copy'

Paste here.  Reply With Quote

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## move along, nothing to see here

Glad to see everyone at the forum today!
Last edited by pbrockway2; 11-20-2011 at 02:56 AM.  Reply With Quote

6. ## Re: finding the power to a number then the user inputs a max a min power

Thanks. I bet my wife someone would tell the OP what his problem was instead of telling him how to find his problem. So now I don't have to pay.  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

Whoops, sorry. I didn't read your first post properly. Knee jerked, fingers typed.  Reply With Quote

8. ## Re: finding the power to a number then the user inputs a max a min power

We'll see if the OP is awake.  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

ok well i have given you my code. here is a test run that i did:
what is the base: 3
what is the first exponent 2
what is the second exponent: 4
81.0
so this is saying that 3^4 is that number. however i also want it to say what 3^2 is and what 3^3 is.
do you understand what i mean?  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

So that "System.out.print(squarenumber)" is only happening once.

Did you do what Norm suggested in #2 and indent everything between { and }? (and nothing else) What did the code look like when you did that?  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

um i am a little confused. didnt i indent it when i posted my code?  Reply With Quote

12. ## Re: finding the power to a number then the user inputs a max a min power

Not correctly. See my post#2.
I have since formatted it according to my standards.  Reply With Quote

13. ## Re: finding the power to a number then the user inputs a max a min power

Add a println to print the value of number immediately after the for statement and see what prints out. It will show you how many times the loop goes around.  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

yes i did that before i posted this: what is the base: 2
what is the first exponent 3
what is the second exponent: 5
3
4
5
64.0
i understand that the for statement works but why doesnt the math.pow read only the last number entered?  Reply With Quote

15. ## Re: finding the power to a number then the user inputs a max a min power

why doesnt the math.pow read only the last number entered
Add a println that prints the values of base and number just before where you call math.pow to show how many times math.pow is being called.  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

ok so i did that:

Java Code:
```     for(number = minnumber; number <= maxnumber; number ++)
System.out.println(base);
System.out.println(number);
squarenumber = Math.pow(base,number);
System.out.print(squarenumber);```
what is the base: 2
what is the first exponent 3
what is the second exponent: 4
2
2
5
32.0
i dont understand what is happening. i didnt do anything to the base in the for statement.  Reply With Quote

17. ## Re: finding the power to a number then the user inputs a max a min power

Why do you have lines 3, 4 and 5 indented? Do you think indenting them will put them in the for loop?  Reply With Quote

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## Re: finding the power to a number then the user inputs a max a min power

ok so do you mean i have to write another for statement? i feel like that is what i have to do. my teacher i think said there shpuld be a lot of for statements. But how would i start it? would it be something like for(squarenumber = Math.pow(base,number).......
Last edited by vicu1; 11-20-2011 at 09:44 PM.  Reply With Quote

19. ## Re: finding the power to a number then the user inputs a max a min power

No, one for statement should do it.

Why do you have the statements on lines 3, 4 and 5 indented? Do you think indenting them will put them in the for loop?
If those statements are outside of the for loop then they should start in the same column as the for.
Here is the correct formatting for your code. There is one statement in the for loop. The other 3 are outside.
Java Code:
```     for(number = minnumber; number <= maxnumber; number ++)
System.out.println(base);
System.out.println(number);
squarenumber = Math.pow(base,number);
System.out.print(squarenumber);```  Reply With Quote

20. ## Re: finding the power to a number then the user inputs a max a min power

Java is not Python; in Python both <statement1> and <statement2> are executed each time the body of the for loop is executed:

Java Code:
```for(number = minnumber; number <= maxnumber; number ++)
<statement1>
<statement2>```
Not so in Java; white space and indentation means nothing to Java. In Java the above could've been writen as:

Java Code:
```for(number = minnumber; number <= maxnumber; number ++)
<statement1>
<statement2>```
Only <statement1> makes up the body of the for loop; if you want both statements to be part of the for loop, you have to use curly brackets:

Java Code:
```for(number = minnumber; number <= maxnumber; number ++) {
<statement1>
<statement2>
}```
Again, space mean nothing to Java, you could've written this instead (as long as the curly brackets are there):

Java Code:
```for(number =
minnumber; number <=
maxnumber; number ++) { <statement1>
<statement2> }```
kind regards,

Jos  Reply With Quote

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