This C++ Program which demonstrates addition of two matrices of same order. The program initializes the matrices, adds each corresponding element of the two matrices and puts the value in the third matrix.

Here is source code of the C++ program which demonstrates addition of two matrices of same order. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C++ program to demonstrate matrix addition`

`*/`

`#include<iostream>`

`using namespace std;`

int main()

`{`

int mat1[3][3], mat2[3][3], mat3[3][3];

`/* Initializing Mat1 and Mat2 */`

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

`{`

for (int j = 0; j < 3; j++)

`{`

mat1[i][j] = i + 1;

mat2[i][j] = j + 1;

`}`

`}`

`/* Adding matrices Mat1 and Mat2 */`

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

`{`

for (int j = 0; j < 3; j++)

`{`

mat3[i][j] = mat1[i][j] + mat2[i][j];

`}`

`}`

cout << "First Matrix : " << endl;

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

`{`

for (int j = 0; j < 3; j++)

`{`

cout << mat1[i][j] << "\t";

`}`

cout << endl;

`}`

cout << "Second Matrix : " << endl;

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

`{`

for (int j = 0; j < 3; j++)

`{`

cout << mat2[i][j] << "\t";

`}`

cout << endl;

`}`

cout << "Third Matrix = First Matrix + Second Matrix : " << endl;

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

`{`

for (int j = 0; j < 3; j++)

`{`

cout << mat3[i][j] << "\t";

`}`

cout << endl;

`}`

`}`

$ g++ main.cpp $ ./a.out First Matrix : 1 1 1 2 2 2 3 3 3 Second Matrix : 1 2 3 1 2 3 1 2 3 Third Matrix = First Matrix + Second Matrix : 2 3 4 3 4 5 4 5 6

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