hi. can you guys help me ?

[monique hepburn]

i am supposed to represent matrices to solve simutaneous equations, add them, find inverse etc.
i am trying to help myself , but i am stuck.all i have managed to do so far is understand how to display a matrix. i am using borland C++. can someone show me how to add 2 matrices.

# include <iostream.h>




# include <math.h>
#include <conio.h>
void main()
{



int a,b,c,d,e,f,g,h,l ;


cout << "Enter a:" << endl;
cin >> a;
cout << "Enter b:" << endl;
cin >>b;
cout << "Enter c:" << endl;
cin >>c;
cout << "Enter d:" << endl;
cin >>d;
cout << "Enter e:" << endl;
cin >>e;
cout << "Enter f:" << endl;
cin >> f;
cout << "Enter g:" << endl;
cin >> g;
cout << "Enter h" << endl;
cin >> h;
cout << "Enter l" << endl;
cin >> l; // if you were to accidentally leave out one of the cins it would say possible l without definition...


int table[3][3] ={{a,b,c},{d,e,f},{g,h,l}};



for(int i =0; i<3; i++)
{

for(int j = 0; j<3; j++)
{
cout<<table[i][j]<<"\t";

}

cout<< endl;
}

getch();

}

[D80DSL3A]

Adding 2 matrices is easy. I see you can assign values to the elements ( as you did with table[][] by prompting the user for the values ). If you have 2 3x3 matrices M1 and M2 then you can add them to find the sum M3 = M1 + M2 by adding the corresponding elements.

int M1[3][3] = {{a,b,c},{d,e,f},{g,h,l}};// if M1 and M2 are given
int M2[3][3] = {{j,k,l},{m,n,o},{p,q,r}};

// find the sum
int M3[3][3];
for(int i =0; i<3; i++)// note that the braces may be omitted if there is only 1 instruction in the loop
    for(int j = 0; j<3; j++)    
        M3[i][j] = M1[i][j] + M2[i][j];

Simple as that!

[SameerThigale]

Code to add 2 matrices of 3 x 3 order(for 2 x 2matrix, change the values of '3' to '2'):

#include<iostream>
using namespace std;
int main()
{
double A[3][3], B[3][3], C[3][3];

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<"Enter a"<<i<<j<<endl;
cin>>A[i][j];
cout<<endl;
}
}

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<"Enter b"<<i<<j<<endl;
cin>>B[i][j];
cout<<endl;
}
}

for (int i=0; i<3; i++)
{
for (j=0; j<3; j++)
{
C[i][j] = A[i][j] + B[i][j];  //addition stored in another matrix; C=A+B
}
}
}

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<"C"<<i<<j<<" "<<C[i][j]<<'\t';
}
cout<<endl;
}

NOTE: I'm a matrix specialist, can send you any code related to matrix, like addition, subtraction, multiplication, inverse(by the method you want), solving system of 2(or 3) equations, etc