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Need help with max/min'ing multiply
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Join Date: Oct 2008
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I've been given a project in which I have to find the highest and lowest possible product using 3 2-digit numbers without repeating any numbers.
For example, the algorithm for the highest would be:
7n * 8n * 9n where the n's would be 4, 5, or 6.
The algorithm for the lowest would be:
1n * 2n * 3n where the n's would be 4, 5, or 6.
So far, I know I will have to give an option of finding the lowest or highest, so I would ask the user to put in 0 to minimize and 1 to maximize. Now, I have thought of using an if statement for reading their input, but I need some kind of loop that will rearrange the 4's, 5's, or 6's. I thought of attaching the values of 4, 5, and 6 to the 90, 80, 70, or 10, 20, 30, but am unsure of how I would code a proper loop or simple if statement to find the best answer by trying each combination. In theory, I could make some really over-extensive amount of code to do it right, but it wouldn't follow curriculum.
The code I have so far is
For example, the algorithm for the highest would be:
7n * 8n * 9n where the n's would be 4, 5, or 6.
The algorithm for the lowest would be:
1n * 2n * 3n where the n's would be 4, 5, or 6.
So far, I know I will have to give an option of finding the lowest or highest, so I would ask the user to put in 0 to minimize and 1 to maximize. Now, I have thought of using an if statement for reading their input, but I need some kind of loop that will rearrange the 4's, 5's, or 6's. I thought of attaching the values of 4, 5, and 6 to the 90, 80, 70, or 10, 20, 30, but am unsure of how I would code a proper loop or simple if statement to find the best answer by trying each combination. In theory, I could make some really over-extensive amount of code to do it right, but it wouldn't follow curriculum.
The code I have so far is
Java Syntax (Toggle Plain Text)
public class Powers { public static void main(String[] args); int input; int numOneTensLow = 10; int numTwoTensLow = 20; int numThreeTensLow = 30; int numOneOnesLow = 4; int numTwoOnesLow = 5; int numThreeOnesLow = 6; int numOneTensHigh = 90; int numTwoTensHigh = 80; int numThreeTensHigh = 70; int numOneOnesHigh = 6; int numTwoOnesHigh = 5; int numThreeOnesHigh = 4; int numOneLow; int numTwoLow; int numThreeLow; int numOneHigh; int numTwoHigh; int numThreeHigh; int lowproduct = (numOneLow * numTwoLow * numThreeLow); int highprodcut = (numOneHigh * numTwoHigh * numThreeHigh); ConsoleIO console = new ConsoleIO(); System.out.println("This program will calculate three two-digit" + " numbers that create the lowest and highest possible products " + "using the numbers 1 through 9 once in each."); System.out.println("To calculate the highest input 1, to calculate" + " the lowest, input 0: "); input = console.readInt(); if(int input = 0); { do { numOneTensLow + NumOneOnesLow; numTwoTensLow + NumTwoOnesLow; numThreeTensLow + NumThreeOnesLow; System.out.println((numOneTensLow + numOneOnesLow) * (NumTwoTensLow + NumTwoOnesLow) * (NumThreeTensLow + NumThreeOnesLow)); } }
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Join Date: Aug 2008
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would love to help you imbestatjava, but i have no clue what you are trying to do
multiply by numbers by products of 7,8,9 and 1,2,3?
that part is understandable, but what is this?
i don't get what these values have to do with anything
multiply by numbers by products of 7,8,9 and 1,2,3?
that part is understandable, but what is this?
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90, 80, 70, or 10, 20, 30
Custom Application & Software Development
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www.houseshark.net
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Join Date: Oct 2008
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The values 90, 80, 70 and 10, 20, 30 have a lot to do with the program because im trying to find the highest possible combination of 9n, 8n, and 7n so it'd be (90 + n) * (80 + n) * (70 + n) where every n must be either 4, 5, or 6. So far the only error I can actually see is in the line of code
Java Syntax (Toggle Plain Text)
public static void main(String[] args);
I think you need to do something like this :
You can do the same way for the Lowest product.
java Syntax (Toggle Plain Text)
highProduct1 = (numOneTensHigh + numOneOnesHigh) * (numTwoTensHigh + numTwoOnesHigh) * (numThreeTensHigh + numThreeOnesHigh); highProduct2 = (numOneTensHigh + numTwoOnesHigh) * (numTwoTensHigh + numOneOnesHigh) * (numThreeTensHigh + numThreeOnesHigh); highProduct3 = (numOneTensHigh + numThreeOnesHigh) * (numTwoTensHigh + numTwoOnesHigh) * (numThreeTensHigh + numOneOnesHigh); highProduct4 = (numOneTensHigh + numOneOnesHigh) * (numTwoTensHigh + numThreeOnesHigh) * (numThreeTensHigh + numTwoOnesHigh); // This way try all combinations, if there are left any others ;-) // then get the max of them. if (max < highProduct1) max = highProduct1; if (max < highProduct2) max = highProduct2; if (max < highProduct3) max = highProduct3; if (max < highProduct4) max = highProduct4; // In the end print out the highest product System.out.println("Highest product is : " + max);
You can do the same way for the Lowest product.
Last edited by verruckt24; Dec 2nd, 2008 at 10:44 am.
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Join Date: Nov 2008
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Your theme posted here is interesting. Min/max, combinatoric algorithms.
Line
Add
Download from http://www.netbeans.org/ NetBans IDE 6.5, select Java SE 37 MB.
and Java SE Development Kit (JDK) 6 Update 11 from http://java.sun.com/javase/downloads/index.jsp ,
or
JDK 6 Update 11 with NetBeans 6.5 from http://java.sun.com/javase/downloads/index.jsp .
It's free.
Install and work.
Advanced editor show to You all wrong points in code before compiling.
Line
public static void main(String[] args); change topublic static void main(String[] args){ Add
}} at end of program.Download from http://www.netbeans.org/ NetBans IDE 6.5, select Java SE 37 MB.
and Java SE Development Kit (JDK) 6 Update 11 from http://java.sun.com/javase/downloads/index.jsp ,
or
JDK 6 Update 11 with NetBeans 6.5 from http://java.sun.com/javase/downloads/index.jsp .
It's free.
Install and work.
Advanced editor show to You all wrong points in code before compiling.
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Join Date: Oct 2008
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I'm supposed to use BlueJ and its supposed to be a three-way multiplication, so I was hoping there could be some kind of loop I could use for this. An example for the maximization would be:
(90 + 6) * (80 + 5) * (70 +4)
And minimization would look like:
(10 + 5) * (20 + 6) * (30 + 4)
And somehow in a loop I would have to try each combination, so if I were to do each individually it would look like a bunch of lines of this:
14 * 25 * 36
14 * 26 * 35
15 * 26 * 34
15 * 24 * 36
16 * 25 * 34
16 * 24 * 35
...and that's just minimization.
Update: Now I get an error of ".class expected" for:
(90 + 6) * (80 + 5) * (70 +4)
And minimization would look like:
(10 + 5) * (20 + 6) * (30 + 4)
And somehow in a loop I would have to try each combination, so if I were to do each individually it would look like a bunch of lines of this:
14 * 25 * 36
14 * 26 * 35
15 * 26 * 34
15 * 24 * 36
16 * 25 * 34
16 * 24 * 35
...and that's just minimization.
Update: Now I get an error of ".class expected" for:
Java Syntax (Toggle Plain Text)
if(int input = 0);
Last edited by IMtheBESTatJAVA; Dec 3rd, 2008 at 9:10 am.
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Update: Now I get an error of ".class expected" for:
Java Syntax (Toggle Plain Text)
if(int input = 0);
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