Thread: input with 2D array and pointers

I am working on a menu driven program for entering grades, etc... The part I having trouble with is the imput. I am trying to use pointer notation to input the grades in a 2D array. 10 rows, 5 columns. So 10 students, and 5 grades each. This is what I have so far, but I dont know what notation to use for imputing into the elements of the 2D array.

Code:

int studentgrades [10][5]={0};
int *i;
i = studentgrades;

/* Enter grades for a student */
int enter_grades(){
      int a, b;

      printf ("Enter student number you want to enter grades for: ");
      scanf ("%d", &a);

      printf ("Enter grades for student number %d: ", a);
      scanf ("%d %d %d %d %d", *(i + (a + 0)));

      printf ("Thank you!");
}

This is just one of the functions for one of the options. Thats all i posted causae thats all that is necessary.

maybe something like :

Code:

int j;
printf ("Enter grades for student number %d: ", a);
for (j = 0; j < 5; j++)
  scanf("%d",&i[a][j]);

That isn't pointer notation though. Thats what I am looking for, pointer notation,

sorry, didn't read your post correctly
try:

Code:

int j;
for (j = 0; j<5; j++)
  scanf("%d",*(i+a)+j);

there is a pretty good tutorial on the subject here

Hmm. I am getting a parse error before the , for some reason. This is what I have in terms of the individual function:

Code:

#include <stdio.h>
#include <stdlib.h>

int studentgrades [10][5]={0};
int a;

/* Enter grades for a student */
int enter_grades(){
      int j;

      printf ("Enter student number you want to enter grades for: ");
      scanf ("%d", &a);

      printf ("Enter grades for student number %d: ", a);
      for (j = 0; j<5; j++){
          scanf ("%d ",((studentgrades+a)+j);}

      printf ("Thank you!");
}

Code:

  ...
  scanf ("%d",*(studentgrades+a)+j);
  ...
  return 0;
}

well it works for me, i thought you are getting parse error here:

Code:

scanf ("%d ",((studentgrades+a)+j);

Originally posted by viaxd
well it works for me, i thought you are getting parse error here:

Code:

scanf ("%d ",((studentgrades+a)+j);

That be correct sir.

int studentgrades [10][5]={0};

I seem to remember something about Prelude saying for 2 dimensional arrays you need to use something else along with the

Code:

{0}

anyone remember. Prelude what about you?
p.s. sorry about the code tags on the cast it wouldn't let me post without them

Isn't it better to use extra sets of curlies when using a multidimensional array. It helps you to keep track of which values are assigned to which array.

Example:

Code:

int New_Array[2][3] = { { 1, 2, 3},  {1, 2, 3} }