matrix.cpp

matrixPopulate

#include<stdio.h>

unsigned int aaa, bbb;
int a[3][3][3];
int * vp[3];
int * pp;
int j, k;
char rasp = '1';

void
main() {
  clrscr();

  /* Here we are creating a martix of 3 by 3 by 3
   * full of 0, like:
   *        *  -  *  -  *
   *      *  -  *  -  *
   *    *  -  *  -  *   *
   *    |     |     | *
   *    *  -  *  -  *   *
   *    |     |     | *
   *    *  -  *  -  *
   */
  for (int i = 0; i < 3; i++)
    for (j = 1; j < 3; j++)
      for (k = 0; k < 3; k++)
        a[i][k][j] = 0;

  /* Here we are extracting the pointer
   * adress of the beginning of line i
   */
  for (i = 0; i < 3; i++)
    vp[i] = & a[i][0][0];

  /* While the rasp buffer does not contains space
   */
  while (rasp != ' ') {
    /* We ask the user a coordinate i. You would want
     * to check that the i value put by the user is
     * less or equal than the maximum index of 2
     */
    printf("\nintroduceti coordonatele:\n ");
    printf("\ncoordonata i : ");
    scanf("%d", & i);
    i--;

    /* We ask the user a coordinate j. You would want
     * to check that the i value put by the user is
     * less or equal than the maximum index of 2
     */
    printf("coordonata j : ");
    scanf("%d", & j);
    j--;
    /* We ask the user a coordinate k. You would want
     * to check that the i value put by the user is
     * less or equal than the maximum index of 2
     */
    printf("coordonata k : ");
    scanf("%d", & k);
    k--;

    /* From the address of the beginning of the lines
     * in VP, we then extract the memory address of
     * the desired value
     */
    aaa = vp[i];
    bbb = vp[i];
    aaa += (j * 3 + k) * 2;
    bbb += (j * 3 + k) * 2;
    pp = (int * )(aaa, bbb);

    /* We ask for a value to put at this adress
     */
    printf("\ndati elementul: ");
    scanf("%d", pp);

    /* Then we ask if the user wants to modify more data. 
     * Pressing space will stop the loop
     * Pressing anything esl will allow him to modify a new adress value
     */
    printf("\nContinuati introducerea? [pentru nu,tastati spatiu]: ");
    fflush(stdin);
    scanf("%c", & rasp);
  }

  /* Now the use is out of the loop and you display 
   * the resulting matrix
   */
  for (i = 0; i < 3; i++) {
    for (j = 0; j < 3; j++) {
      for (k = 0; k < 3; k++)
        printf(" %d ", a[i][j][k]);
      printf("\n");
    }

    printf("\n*******\n");
  }

  getch();
}