Posts by mrnutty

I have finals this week and next, so I can't do anything now, but in a week and a half, I can make problems, or help. Do you guys think we should make a list of problems here and go from that?

I think using glScale would work.

Don't use define.
Use this :

const unsigned int MAX_SIZE = 6;
int main(){ ... }

For sorting and searching use the stl sort and find method.

So to start have this :

#include<iostream>
#include<algorithm> //for search and sort methods

using namespace std;

int menu(); //returns a choice from sorting and/or searching

int main(){
  const unsigned int MAX_SIZE = 10;
  int Array[MAX_SIZE] = {0}; //set all elements to 0
 
   int choice = menu();
  if(choice == 1) { std::sort(Array, Array + MAX_SIZE ); }   //then display it
else if(choice == 2) { std::find(...) ; }
else;// print errror

return 0;
}

Try degubbing it. Print out everything in the map before and after you
make that search call.

Is it in the same directory? Show some code?

In C++ term of reference or in general ?

You can do this :

Complex& Complex::getClass() { return *this; }

That way, you get the Complex class as a reference in terms of the reference operator.

try something like this :

char *Index[2] = { "Index of first(", "Index of second(" }; //and so on

int cntr = 0;
while(start != end) //start and end are the beginning and the end iterator of a container
{
    cout << Index[cntr] << *start <<")"<<endl;
    start++;
}

Can you use remove_if ?

Go to youtube and learn about functions from professors. Youtube has many good programming videos. try it out.

In your load function, you want to load in the data the exact way you
saved it right? Can you take it from there?

Wow, people clearly didn't like my simple most obvious answer :P

They didn't like that one either.

plzzzzzzzzz tel me basics thing of programing

yaaa gotta make variables, then use ifs and loops is ther anythn else ya gotta know?

Ya gotta learn english 1st.

>>. I also have to get these 2 classes to communicate somehow so it can use the hours from array2 and the pay from array1 to come up with a total pay amount.
>>I just don't know how to make the 2 classes communicate.

There are couple of ways.

But I suggest you make a function, that calculates the total pay amount.

float calculateTotalPay(const ClassOne& pay, const ClassTwo& rate){...}

This part is wrong :

inF >> id;
while (!inF.eof())
	{
		cnt++;
		myStuds[cnt].id = id;
		myStuds[cnt].fname = fname;
		myStuds[cnt].lname = lname;
		for (int i = 1; i < 5; i++)
			inF >> myStuds[cnt].gr[i];
		myStuds[cnt].avg = 0.0;
		myStuds[cnt].letGr = 'Y';
		inF >> id;
	}

I assume you wan't something like this :

while(!inF.eof()){
	inF >> myStuds[cnt].id;
	inF >> myStuds[cnt].fname;
	inF >> myStuds[cnt].lname;
	for (int i = 0; i < 6; i++)
		inF >> myStuds[cnt].gr[i];
	inF >> myStuds[cnt].avg;
        int grade = 0;
	inF >> grade;
       myStuds[cnt].letGr =  convertNumberToLetterGrade(grade);

    ++cntr;
}

>>I think do you have the idea and please help me sir with my project...

Not really, care to explain a bit more?

>>I m having a lot of errors please help

Can you post the errors, and what line it points to?

That sounds really boring to me :icon_neutral:
I thought the problem would be a slightly less specific, such as to create a game of snake or tetris or make a program to achieve something within certain restrictions, where you can apply lots of creativity (obviously that would be Intermediate / Advanced), but that sounds more appealing to me.

Thats sounds good but the problem with that is the time it would
take to asses every program. Making a game would not be a bad idea
but it would be hard to evaluate it. Anyways, my suggestion was just
a suggestion, as is yours. So I don't really know. Anyone else have more ideas?

Well. . even among the dedicated members, there is a lot of variation in skill here. Wouldn't it be better to have 3 different levels, similar to Sane's challenge at Daniweb's sister site, PFO?

I was thinking something like :

abstract Problem : general ( what we are trying to solve ).

Inherit from abstract :Beginner version : Easy implementation, just get it to work

Inherit from abstract : Intermediate version : A slight variation
of the problem, to make it harder. Have it neat, clean, error
checking, no fails. And works for all cases

Inherit from abstract : Others : A harder variation,
works flawlessly, and is very fast, with good coding style.

Maybe the first few should be reasonable so people could join and
get the hang of it?

If I want to define what is a double -> double function pointer I use:

typedef double (*double_fp1)(double);

But what if I would like to distinguish
const double -> double
it is possible?
And the above definition consists the const double -> duble function?

you mean :

const double_fp1  =  &myDoubleFunction;

The cmath library already has the power function so you don't have to
create a function. Plus your syntax is horrible.

You got the idea correct but not the logic and the syntax.

This is what you should be doing

#include<iostream>
#include<cmath>

using namespace std;

int main()
{
 float input = 0.0f;
 bool goAgain = true;

 while(goAgain){  
 //ask user for which function to use
  cout <<"1) Power function\n";
  cout <<"2 Sqrt function\n";  
  int choice = 0;
  cin >> choice;

  //ask user to enter a number to either use pow or sqrt
  cout<<"Enter a number : ";
  cin >> input;

  if(choice == 1){
   //print the power of input
  }
  else if(choice == 2){  
   //print the sqrt root of input
  }
 
  cout<<"Try again (0 = no), (1 = yes ) : ";
  cin >> goAgain;  

  }

}

Pick 1 or 2 or all of them :

Nehe
http://sabia.tic.udc.es/gc/practicas/opengl_tut_externos/semwal%20tutorial/indexGLTutorial.html
http://www.lighthouse3d.com/opengl/glut/
http://www.swiftless.com/tutorials/opengl/opengltuts.html
http://www.nullterminator.net/opengl32.html
http://www.morrowland.com/apron/tut_gl.php
http://www.falloutsoftware.com/3D-OpenGL-Tutorials.htm (very good lighting tutorial )
http://www.videotutorialsrock.com/
Free openGL red book

Posted in the correct thread this time. This is also another way, and still
naive. It shows both static_assertion and exceptions.

#include<iostream>

using namespace std;
 
template<typename Type>
struct assert_numeric{ const static int i = 0; };

template<> struct assert_numeric<short>					{ const static int i = 1;	};
template<> struct assert_numeric<unsigned short>		{ const static int i = 1;	};
template<> struct assert_numeric<int>					{ const static int i = 1;	};
template<> struct assert_numeric<unsigned int>			{const static int i = 1;	};
template<> struct assert_numeric<float>					{ const static int i = 1;	};
template<> struct assert_numeric<double>				{ const static int i = 1;	};

template<typename Type>
class Numeric{

public:		
	 struct BadType : std::exception{
		BadType(const char *msg) : exception(msg){}
	};
public:
	Numeric()
	{ 
		//int asserter[assert_numeric<Type>::i];// Way# 1 cannot have an array of size 0
		
		if(assert_numeric<Type>::i == 0) //Way number 2 : throw custom exception
			throw BadType("Type is not numerical!");
	}
	~Numeric(){ }
};

int main()
{

	try{
		Numeric<char> j;
	}
	catch(Numeric<char>::BadType& e){ cout << e.what() <<endl; }
	

 
  return 0;
}

Boy that went on the wrong thread. Thats it. I need some sleep. And the static assert is also shown in the example.

I think in the other post of Narue, it talks static_assert.

Thread split from ancient thread, moved and given an appropriate title :)

@OP: You need to read this

aww man. I though some n00b came up with this title. I should have
known. This is funny though.

Don't make it too simple, because it's only fun if we need to bend our brains a bit.
I don't really feel like making the n-gazillion'st palindrome-finder for example.

Oh, you guys were expecting me to do it? But I want to participate
too...lol.

I guess I could make a thread or two. But eventually we need some
rotation going around. I though maybe some mods, could make
a special thread or something?

Well there are also other ways.

Here is a another way :

#include<iostream>

using namespace std;
 
template<typename Type>
struct assert_numeric{ const static int i = 0; };

template<> struct assert_numeric<short>					{ const static int i = 1;	};
template<> struct assert_numeric<unsigned short>		{ const static int i = 1;	};
template<> struct assert_numeric<int>					{ const static int i = 1;	};
template<> struct assert_numeric<unsigned int>			{const static int i = 1;	};
template<> struct assert_numeric<float>					{ const static int i = 1;	};
template<> struct assert_numeric<double>				{ const static int i = 1;	};

template<typename Type>
class Numeric{

public:		
	 struct BadType : std::exception{
		BadType(const char *msg) : exception(msg){}
	};
public:
	Numeric()
	{ 
		//int asserter[assert_numeric<Type>::i];// Way# 1 cannot have an array of size 0
		
		if(assert_numeric<Type>::i == 0) //Way number 2 : throw custom exception
			throw BadType("Type is not numerical!");
	}
	~Numeric(){ }
};

int main()
{

	try{
		Numeric<char> j;
	}
	catch(Numeric<char>::BadType& e){ cout << e.what() <<endl; }
	

 
  return 0;
}

Nothing is wrong with *this, except that it doesn't solve the problem. Calling multiply within the operator* function produces the same incorrect answer in the resulting matrix.

Thats a problem with you multiply function then. Check the formula.

Whats the problem with :

Matrix Matrix::operator* (const Matrix &B){
Matrix temp;
multiply(*this,B,temp);
return temp;
}

Summer. Because there is no school. Just eat, sleep, and poop, among other things.

>>But this looks ugly and I had to use a separate variable.

I think that looks beautiful. In fact you can just make a function that does that, and so it will be in a sense a one liner.

I don't think there is a standard implementation of getch in C

so for instance say i did dataTable->at(key) would i be referring to the list or vector? or both?

dataTable is a vector.

dataTable is a list

dataTable.front() is the int.

And also I don't think mixing up vectors and list would be a good
idea, unless it really really makes sense to do so.

>>"The vector holds a list of data type int? "

the word list has ambiguity.

A better term(IMO) would be : The vector contains a container in which the contained container is of type int and the contained container is a stl's list container.

From :

while ((cin >> ar[i]) && (i < arSize))

To :

while ((i < arSize) && (cin >> ar[i]) )

So I was thinking, we should have a challenge of the day or week,
for a specific language, that poses a unique problem. This way people can practice, and others can learn maybe something new from someone else's idea. What do you guys think ? For example in our
C++ section, we can have a C++ challenge question. And people can participate in it. I know I would like to know other people solutions
to a problem. That way it will help me think in different ways.

Then you can either make multiply a template function. Or make mystruct
a template class with myclass begin a template class that takes 2
typenames argument.

Or Use us as a reference.

inside the operator*, call the multiply function.

Now try to create a soduko solver, if you dare. (NO cheating).

O M G

>>The you can just concat title with first name.

That was my objection. Those two can not be joined.

Are you talking about conceptually or technically?

So you want the call to myobj1.function() to work?

lastElem =remove_if(v1.begin(), v1.end(), islowerCase);//line1

Line 1 : remove_if(...), if the containers contains a lower case character
the function removes it. It does this, and returns the a pointer that
points to the new end since some elements has been deleted.

ostream_iterator<char> screen(cout, "");//line2

Line 2 : creates an iterator. Just like the vector::iterator, ostream_iterator is an iterator. It can insert elements into the
ostream object, cout. When you do :

cout << 'a';

Its almost the same as if you do :

screen = 'a';

Its just doing it in a different way.

copy(v1.begin(), lastElem, screen);//line3

Remember what I said, if you do screen = 'a'; It will print out a into the
console. So the above code roughly does screen = vec[0] ... vec[lastElement]. That means everything inside the vector is getting
printed to the screen.

Also check this out for some reference : remove_if , istream_iterator using std::copy

did you get the texture to load onto a shape?

Wrong answer. Those strings don't have enough space allocated to concatenate them (see original post). Each of those strings need to be copied into some buffer that is large enough to hold all the strings at one time.

Oh, when I said result, I was implicitly talking about a new result string, as suggested by the function prototype that I gave. I thought it was obvious but I guess not.

I have made my own image load function that reads the file extension and loads the image with the appropriate method. but at the moment it can only load bitmaps. and i know now why the image wasn't loading properly, the image was 8 bit but the function was reading it assuming it was 24 bit. how could i discard the pixels that are a certain colour (the colour around the edge)?

just use a software to convert it into a 24bit bitmap

They have it , in the link I provided you with.

Do you know functions ? loops? classes ? templates ? structs ?
polymorphism ? inheritance ? pointers ? data structures ?

see here

Well what do you know so far?

Since "I started learning C++ November 14th 09!!"

Then I would suggest to keep learning it more a while.

Put the definition in the same file as the templete header, unless your
compiler supports the keyword export.