Problem with .CPP program output HELP please!!!

This is a discussion on Problem with .CPP program output HELP please!!! within the C++ Programming forums, part of the General Programming Boards category; I am a beginner in C++ .i wrote this code in which operator is overloaded on matrices.Go thru the program; ...

  1. #1
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    Jan 2006
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    Unhappy Problem with .CPP program output HELP please!!!

    I am a beginner in C++ .i wrote this code in which operator is overloaded on matrices.Go thru the program;
    Code:
     :
                                     /*prog.cpp*/
    #include<iostream.h>
    #include<conio.h>
    int k=1;
    class matrix
    {
    	private:
    			static int a[20][20];
    			int m,n;
    	public:
    			friend istream& operator>>(istream &cin,matrix&);
    			friend ostream& operator<<(ostream &cout,matrix);
    			friend matrix operator+(matrix,matrix);
    			friend matrix operator-(matrix,matrix);
    			friend matrix operator*(matrix,matrix);
    			friend matrix operator/(matrix,matrix);
    };
    
    istream& operator>>(istream &cin,matrix &a)
    {
    	int i,j;
    	cout<<"Enter the size of the matrix m,n"<<endl;
    	cin>>a.m>>a.n;
    	cout<<"Enter the matrix"<<endl;
    	for(i=0;i<=a.m-1;i++)
    	for(j=0;j<=a.n-1;j++)
    	  cin>>a.a[i][j];
    	return(cin);
    }
    ostream& operator<<(ostream &cout,matrix a)
    {
    	int i,j;
    	cout<<"The matrix is as follows"<<endl;
    	for(i=0;i<=a.m-1;i++)
    	{
    	  for(j=0;j<=a.n-1;j++)
    	   cout<<a.a[i][j]<<"\t";
    	  cout<<"\n";
    	}
    	return(cout);
    }
    matrix operator+(matrix a,matrix b)
    {
    	matrix c;
    	int i,j;
    	c.m=a.m;
    	c.n=a.n;
    	for(i=0;i<=a.m-1;i++)
    	for(j=0;j<=a.n-1;j++)
    	c.a[i][j]=a.a[i][j]+b.a[i][j];
    	return(c);
    }
    
    matrix operator-(matrix a,matrix b)
    {
    	matrix c;
    	int i,j;
    	c.m=a.m;
    	c.n=a.n;
    	for(i=0;i<=a.m-1;i++)
    	for(j=0;j<=a.n-1;j++)
    	c.a[i][j]=a.a[i][j]-b.a[i][j];
    	return(c);
    }
    matrix operator*(matrix a,matrix b)
    {
    	matrix c;
    	int i,j;
    	c.m=a.m;
    	c.n=b.n;
    	if(a.n==b.m)
    	{
    	 for(i=0;i<=a.m-1;i++)
    	 for(j=0;j<=b.n-1;j++)
    	 for(k=0;k<=a.n-1;k++)
    	  c.a[i][j]+=a.a[i][k]+b.a[k][j];
    	}
    	 else
    	  k=0;
    	return(c);
    }
    matrix operator/(matrix a,matrix b)
    {
    	matrix c;
    	int i,j;
    	c.m=a.m;
    	c.n=a.n;
    	for(i=0;i<=a.m-1;i++)
    	for(j=0;j<=a.n-1;j++)
    	c.a[i][j]=(float)a.a[i][j]/float(b.a[i][j]);
    	return(c);
    }
    main()
    {
    	matrix a,b,c,d,e,f;
    	cin>>a>>b;
    	c=a+b;
    	d=a-b;
    	e=a*b;
    	f=a/b;
    	cout<<"The addition of matrices is:"<<"\n"<<c;
    	cout<<"The subtraction of matrices is:"<<"\n"<<d;
    	if(k==1)
    	cout<<"The multiplication of matrices is:"<<"\n"<<e;
    	else
    	cout<<"The multiplication of matrices is not possible"<<endl;
    	cout<<"The division of matrices is:"<<"\n"<<f;
    	getch();
    	return(0);
    }
    When i compile the above prog i get an error :
    "Linker error:undefined symbol matrix::a in module prog.cpp"

    please help me out with the error.

  2. #2
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    Why is the member array a static?

  3. #3
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    Code:
    class matrix
    {
    	private:
    			static int a[20][20];

    u need to declare static int a[20][20] outside the class and use it directly.

  4. #4
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    4
    thanks 4 helping me out.The main problem was that a clas cannot have a static member.
    thx

  5. #5
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    7,317
    A class can have a static member, you just didn't implement it completely. In this case, though, the array shouldn't have been static anyway since each matrix instance should have its own data.

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