#include <stdio.h>


#define N 3  // size of the matrix


int main() {

    int i, j;

    int A[N][N] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

    int B[N][N] = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};

    int C[N][N];  // result matrix


    // perform matrix addition

    for (i = 0; i < N; i++) {

        for (j = 0; j < N; j++) {

            C[i][j] = A[i][j] + B[i][j];

        }

    }


    // print the result matrix

    printf("Result matrix:\n");

    for (i = 0; i < N; i++) {

        for (j = 0; j < N; j++) {

            printf("%d ", C[i][j]);

        }

        printf("\n");

    }


    return 0;

}

This program defines a 3x3 matrix A and a 3x3 matrix B, and performs their addition to produce a new 3x3 matrix C. It then prints the resulting matrix to the console.

When you compile and run this program, it should print the following output:

Result matrix:
10 10 10
10 10 10
10 10 10

This is the result of adding the two matrices A and B element-wise.