matrix multiplication in c

PROGRAM:

#include <stdio.h>

void read_matrix(int m2[][3] )
{
    int i, j;
    printf("input values for matrix in order of rows first \n");
    for (i = 0; i < 3; i++)
    {       
        for (j = 0; j < 3; j++)
        { 
            scanf("%d",&m2[i][j]);          
        }
    }

    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            printf("%d ", m2[i][j]);
        }
        printf("\n");
    }
}

void multiply_matrices(int m1[][3], int m2[][3] ,int m3[][3])
{
    int i, j, k; 

    for (i = 0; i < 3; i++){
        for (j = 0; j < 3; j++){
            for (k = 0; k < 3; k++){
                m3[i][j] +=m1[i][k]*m2[k][j]; 
            }
        }
    }
}

void write_matrix(int m3[][3] )
{
    int i, j; 

    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            printf("%d ", m3[i][j]);
        }
        printf("\n");
    }
}

int main(void)
{
    int matrix1[3][3], matrix2[3][3], matrix3[3][3]; 

    read_matrix(matrix1);
    read_matrix(matrix2);

    multiply_matrices(matrix1, matrix2, matrix3);

    write_matrix(matrix3);

    return 0;
}

OUTPUT:

input values for matrix in order of rows first
1
2
3
2
2
2
1
2
2
1 2 3
2 2 2
1 2 2
input values for matrix in order of rows first
2
1
1
1
2
1
2
1
2
2 1 1
1 2 1
2 1 2
-858993450 -858993452 -858993451       /*This is the multiplied matrix output!*/
-858993450 -858993452 -858993452
-858993452 -858993453 -858993453
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