Calculate matrices in C++

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I have written this code but have 3 errors I can't fix.
Can anyone help me with this?

C++

//this program will find the product of two matrices (2columns X 2rows)...
#include<iostream.h>
class A {
	int x ;
	A(){}
	A(int a){x=a;}
	void out(){cout<<"Enter the value of matrix a:\n";}
};
class B{
	int x;
	B(){}
	B(int a){x=a;}
	void out(){cout<<endl<<"Enter the value of matrix b:\n";}
};
class C{
int x;
	C(){}
	C(int a){x=a;}
	void out(){cout<<"The multiplied value is:\n";}
};


void main() {
int a[4][4],b[4][4],c[4][4];
int i,j,k;
  A a1();
  a1.out();

for(i=0;i<2;i++){

for(j=0;j<2;j++){

cin>>a[i][j];
}
}
B a2();
a2.out();

for(i=0;i<2;i++){

for(j=0;j<2;j++){

cin>>b[i][j];
}
}


C a3();
a3.out();

for(i=0;i<2;i++){

for(j=0;j<2;j++){

c[i][j]=0;
for(k=0;k<2;k++){

c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
}
}
}
for(i=0;i<2;i++){

for(j=0;j<2;j++){

cout<<c[i][j]<<"  ";
}
cout<<"\n";
}
}</iostream.h>

Posted 19-May-10 7:27am

danger man 2011

Updated 19-May-10 7:45am

Moak

v3

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Richard MacCutchan 19-May-10 17:07pm

Please do not post the same question more than once, just edit the original so all your answers are kept together.

1 solution

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CPallini · Accepted Answer · 2010-05-19T08:59:00

Solution 1

You forgot to declare class methods (constructor included) as public. For example:

C++

class A {
    int x ;
public:
    A(){}
    A(int a){x=a;}
    void out(){cout<<"Enter the value of matrix a:\n";}
};

The syntax you used for creating class instances is wrong, for instance use

A a1;

instead of

sameer 2010 wrote:
A a1();

Posted 19-May-10 8:59am

CPallini

Comments

danger man 2011 19-May-10 15:03pm

thanks