C example to print multiple table by reading data from the table

#include <stdio.h>
int main()
{
    int n;
    int m;
    int cntr;
    long long product;
    FILE*ark = fopen("Tablas de Multiplicar.dat","w");
    printf("¿Qué tabla de multiplicar desea conocer (Registre número)\n");
    scanf("&d", m);
    printf("¿Hasta qué número la desea calcular? (Registe número)\n");
    scanf("%d", &n);
    for (cntr = 1;  n=1; n++)
    {
        product= m*n;
        printf("%d %lld\n", cntr, product);
        fprintf(ark, "%d %lld\n", cntr, product);
    }
    return 0;
}