Classes: Getting Error Message

This is a discussion on Classes: Getting Error Message within the C++ Programming forums, part of the General Programming Boards category; Hey, all! I am in my first programming class and have done pretty well thus far. I am running into ...

  1. #1
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    Classes: Getting Error Message

    Hey, all! I am in my first programming class and have done pretty well thus far. I am running into error messages and cannot figure out where I went wrong - please help if you can. Thanks in advance.

    This is the program I have developed:
    Code:
    //Program that defines a class called Plot that contains private members.
    #include <iostream>
    #include <stdlib.h>
    
    using namespace std;
    
    class Plot
    
    
    {
    public:
    	Plot(double,double);
    	void setlength (double l);
    	void setwidth (double w);
    double getlength();
    double getwidth();
    float area();
    float perimeter();
    private:
    	double length;
    	double width;
    };
    
    	Plot::Plot(double,double)
    {
    	length = l;
    	width = w;
    }
    
    void Plot::setlength(double l)
    {
    	length = (l >= 0.0 && l <= 7.0)?l = 0;
    }
    void Plot::setwidth(double w)
    {
    	width = (w >= 0.0 && w <= 9.0)?w = 0;
    }
    float Plot::area()
    {
    	return (l * w);
    }
    float Plot::perimeter()
    {
    	return (2*(l + w));
    }
    int main()
    {
    	Plot rect(7,9);
    	cout<<"The area of the retangle is "<<rect.area()<<endl;
    	cout<<"The perimeter of the rectangle is "<<rect.perimeter()<<endl;
    	return 0;
    }
    Here are the error messaged I am getting:
    Code:
    error C2065: 'l' : undeclared identifier
    error C2065: 'w' : undeclared identifier
    error C2143: syntax error : missing ',' before ';'
    error C2143: syntax error : missing ',' before ';'
    Where the heck would I be missing commas? I have tried to move what I though was the identifier around, but it just causes more chaos. Anything to help is appreciated!

  2. #2
    C++ Witch laserlight's Avatar
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    Code:
    float Plot::area()
    {
    	return (l * w);
    }
    float Plot::perimeter()
    {
    	return (2*(l + w));
    }
    What is l and w? Perhaps you wanted to use length and width instead.
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  3. #3
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    what is with setwidth and setlength are u trying to do an if statement there cause thats wrong. and what are u oing woth the functions getwidth and getlength they are doing nothing

  4. #4
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    for the area and perimeter you need to feed it l and w inorder to calculate, also how bout a default constructor, you have an overloaded one but no default. also for the overloaded you need what variable the double is, it dont know. there are many things wrong with your code but start with what i said and go from there i got it working for me but after i murdered ur code though

  5. #5
    #define WORLD "sad place" LinuxCoder's Avatar
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    Code:
    void Plot::setlength(double l)
    {
            length = (l >= 0.0 && l <= 7.0)? l = 0;
    }
    Is it just me or the syntax is all wrong here? i believe it should be
    Code:
    void Plot::setlength(double l)
    {
            length = (l >= 0.0 && l <= 7.0)? l : 0;
    }
    Notice the ':' i believe that can be causing the missing commas error since all the punctuation is being evaluated incorrectly from this point on. Notice this is also happening in Plot::setwidth() method.

    Cheers

  6. #6
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    LinuxCoder - you are awesome! I made the change as suggested and it worked. Intead of using l and w, I switched to "length" and "width". I figured extra typing was worth making the program run!

    Thanks again!

  7. #7
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    Why are you mixing float and double? Just use double everywhere.

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