package matriz;
import javax.swing.JOptionPane;

/**
 *
 * @author adiela
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String num,b;
          int x=0,i=0;
          int  suma=0;
          int matriz[][]=new int [3][4];
           String vec[]=new String[10];
           float prom;


          for (int f=0;f<3;f++)
         {
          for (int c=0;c<4;c++)
           {
             num=JOptionPane.showInputDialog("ingrese numero");
             matriz [f][c]=Integer.parseInt(num);
           }
          }
          for (int f=0;f<3;f++)
          {
         for (int c=0;c<4;c++){
              suma=suma+matriz[f][c];
            }
        }
        prom=suma/12;

        JOptionPane.showMessageDialog(null, "El promedio es"+prom);
 
    }

}