Programming Forums > Application Development > C++

grumpy · Dec 8th, 2006, 10:24 PM

Quote:

Originally Posted by aznballerlee

Similarly, if we used pointers for the Span parameters, would this apply?

double getOverlap (Span *span1, Span *span2)

(Toggle Plain Text)

double getOverlap (Span *span1, Span *span2)
{
    int m_high, m_low;
    if (this -> low() > this -> low())
        low = this -> low();
    else
    {   
        low = this -> low();
    }

    if (this -> high() < this -> high())
        high = this -> high();
    else
    {
        high =  this -> high();
    }

    int a = high - low;
    if (a>=0)
        return a;
    else
        return 0;
}

And throw this code away. It will not compile. The "this" keyword can only be used in non-static member functions of a class. And, even if you made this function a member function, the logic is cocked up.

aznballerlee · Dec 8th, 2006, 10:53 PM

double getOverlap (Span *span1, Span *span2)

I'm stuck then! I need to think of a way to implement the same task using pointers in the parameters.

If

(Toggle Plain Text)

this

doesn't work, what can I use??

grumpy · Dec 8th, 2006, 11:21 PM

Read my second last post (#20 in this thread): the answer is there, but you will have to think about it.

aznballerlee · Dec 8th, 2006, 11:48 PM

I used the same idea as post 20. Your advice was to use the ->
since we are dealing with pointer parameters.

(Toggle Plain Text)

double getOverlap (Span *span1, Span *span2)
{
	int high, low;
	if (span1 -> low() > span2 -> low())
		low = span1 -> low();
	else
	{   
		low = span2 -> low();
	}

	if (span1 -> high() < span2 -> high())
		high = span1 -> high();
	else
	{
		high =  span2 -> high();
	}

	int a = high - low;
	if (a>=0)
		return a;
	else
		return 0;
}

Dec 8th, 2006, 10:53 PM	#22
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	double getOverlap (Span span1, Span span2) I'm stuck then! I need to think of a way to implement the same task using pointers in the parameters. If (Toggle Plain Text) this this doesn't work, what can I use??

Dec 8th, 2006, 11:48 PM	#24
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	I used the same idea as post 20. Your advice was to use the -> since we are dealing with pointer parameters. (Toggle Plain Text) double getOverlap (Span span1, Span span2) { int high, low; if (span1 -> low() > span2 -> low()) low = span1 -> low(); else { low = span2 -> low(); } if (span1 -> high() < span2 -> high()) high = span1 -> high(); else { high = span2 -> high(); } int a = high - low; if (a>=0) return a; else return 0; } double getOverlap (Span span1, Span span2) { int high, low; if (span1 -> low() > span2 -> low()) low = span1 -> low(); else { low = span2 -> low(); } if (span1 -> high() < span2 -> high()) high = span1 -> high(); else { high = span2 -> high(); } int a = high - low; if (a>=0) return a; else return 0; }

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Dec 8th, 2006, 11:21 PM	#23
grumpy Programming Guru Join Date: Jun 2005 Location: Adelaide, South Australia Posts: 1,223 Rep Power: 5	Read my second last post (#20 in this thread): the answer is there, but you will have to think about it.

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