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mutlipication table in java program

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LKH

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mutlipication table in java program

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Oct 6th, 2009

how to create a mutlipication table in java program for example:
enter x=5
enter y =6

output is:
1*6=6
2*6=12
3*6=18
4*6=24
5*6=30

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Oct 6th, 2009

1) Create a array, which represents a table.
2) use a for loop;

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 Java Syntax (Toggle Plain Text) 
for(int i = 1; i != 5; i++)
    myArrayTable[i] = 6*i; //say, myArrayTable is already declared.
for(int i = 1; i != 5; i++)
    myArrayTable[i] = 6*i; //say, myArrayTable is already declared.

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Originally Posted by firstPerson

1) Create a array, which represents a table.
2) use a for loop;
Help with Code Tags

Java Syntax (Toggle Plain Text)
for(int i = 1; i != 5; i++)
    myArrayTable[i] = 6*i; //say, myArrayTable is already declared.
for(int i = 1; i != 5; i++) myArrayTable[i] = 6*i; //say, myArrayTable is already declared.

I have a question:
Why didn't you use this at the for loop:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
for(int i = 1; i < 5; i++)
for(int i = 1; i < 5; i++)

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0805638

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its easier using 2 classes.

Oct 6th, 2009

1)
Class: Multiply
Attributes: int x
int y
Methods: getters&setters
Constructors
toString

in Main
create array or arraylist of the class Multiply
take in the 2 numbers into each
to print:
iterate through the array and print the "Multiply.toString()" and the "toString()" will include the "x*y = z" to form each line

I would recomend using the IDE's BlueJ or Netbeans (Netbeans does most of it for you hence is my favourite)

any errors in my repllies then pm me please as I am also a learner

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LKH

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Oct 13th, 2009

sorry! I am new learner for java program, I still confuse about your answer. can you give me some example for this program, thanks...

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Oct 13th, 2009

They just gave you a more than sufficient reply. If you don't understand the reply either go study about for loops and arrays, or ask a specific question if there is something you don't understand. We can't read your mind.

Out.

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Originally Posted by javaAddict

I have a question:
Why didn't you use this at the for loop:
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Java Syntax (Toggle Plain Text)
for(int i = 1; i < 5; i++)
for(int i = 1; i < 5; i++)

late reply but its just preference at times.

A thing to note ( at least in c++) is that != is more generic than
'<' because '!=' works with containers like vectors, string map
while '<' is not compatible with all of them. I imagine that
java is similar. It also depends on context btw.

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Nov 3rd, 2009

interesting point. I haven't seen the non-equals operator used as a loop conditional before. I have to admit that what you said makes sense. I would have never thought of it in that way before. But . . . what guarantee do you have that you are actually comparing values in c++? wouldn't a statement like objecta != objectb be interpreted as: The address where objecta resides is not equal to the address where objectb resides?
Besides, c++ allows you to overload your operators so there is no ambiguity. The classes you are talking about may have just implemented that.
But as far as comparing primitives? Sure != 5 looks hunky dory. I've been using comparison operators for the last 15 years, so I don't thnink I'll all of the sudden switch though.

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>>
"what guarantee do you have that you are actually comparing values in c++?"
<<

In c++ the "!=" operator when used with container from std does not compare address like the "==" in java ( at times), it only compares
the values. The standard C++ library was implemented with generic in
mind.

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#10

Nov 3rd, 2009

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Originally Posted by firstPerson

In c++ the "!=" operator when used with container from std does not compare address like the "==" in java ( at times), it only compares
the values. The standard C++ library was implemented with generic in
mind.

Well, if that is the case, those operators would have had to have been overloaded for those operations, otherwise the comparitors would compare addresses. I would have to go and look at the library code, (I use DevC++) to check and see if that's the case. I'm pretty sure that for any object regardless if it's in a collection or not will have to have the comparitors overloded in addition to providing a deep copy constructor. Come to think of it, if you call something to the effect of:

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 c++ Syntax (Toggle Plain Text) 
someCollection<someClass> someObject[] = new someCollection<someClass>()[2];
someObject[0] = someData;
someObject[1] = otherData;
 
if (someObject[0] != someObject[1])
{
   std::cout << "AHHHHHH!!!! Run for your lives!!! ";
}
someCollection<someClass> someObject[] = new someCollection<someClass>()[2];
someObject[0] = someData;
someObject[1] = otherData;

if (someObject[0] != someObject[1])
{
   std::cout << "AHHHHHH!!!! Run for your lives!!! ";
}

that operator will be called from the overloaded operator defined in someClass, not someCollection. What I was saying, without knowing if someObject overloads !=, you have no guarantee that you are comparing someData and otherData. If not you will be comparing the dereferenced addresses of each object. So in java, this is one of the reasons that all classes derive from Object. That way, they can implement the equals() method to ensure that you are comparing by value and not by reference.
Also, c++ calls generic types template types. But you knew that.
So . . . should this thread be moved to c++ or did LKH get his answer? Sorry for the rambling.

Last edited by eggmatters; Nov 3rd, 2009 at 3:18 pm.