CODEWITHSUNDEEP
cmemory-managementmultidimensional-array
Mumfordwiz
Mumfordwiz

Reputation: 1545

allocates memory for a 2D array

I'm allocating memory for a 2D array I think I'm doing it good, but when I at the memory it seems to be different that what I wrote.

int size = 4;
table = (int**)malloc(size*sizeof(int*));
int i;
for (i = 0; i < size; i++)
{
    table[i] = (int*)malloc(size*sizeof(int));
}

But when I look in the debugger, after I add all the elements of a 4X4 2D array. It seems like I have more than 4 columns. I just add int in a regular way

table[i][j] = num;

any help will be greatly appreciated!

Thank!

EDIT: code of adding the int

int lineCounter = 0;
char line[200];
while (fgets(line, 200, fr) != NULL)
{  
    i = 0;
    char* split;
    int num;
    split = strtok(line, " ");
    sscanf(split, "%d", &num);

    table[lineCounter][i] = num;
    i++;
    for (i ; i < size; i++)
    {
        int num;
        split = strtok(NULL, " ");
        sscanf(split, "%d", &num);
        table[lineCounter][i] = num;
    }
    lineCounter++;
}

Upvotes: 0

Views: 96

Answers (1)

Gopi
Gopi

Reputation: 19864

Check the code below:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
   int j,i;
   int **table;
   int lineCounter = 0;
   char line[200];
   int size = 4;
   table = (int**)malloc(size*sizeof(int*));

for (i = 0; i < size; i++)
{
    table[i] = (int*)malloc(size*sizeof(int));
}

while (fgets(line, 200, stdin) != NULL)
{  
    i = 0;
    char* split;
    int num;
    split = strtok(line, " ");
    sscanf(split, "%d", &num);

    table[lineCounter][i] = num;
    i++;
    for (; i < size; i++)
    {
        int num;
        split = strtok(NULL, " ");
        sscanf(split, "%d", &num);
        table[lineCounter][i] = num;
    }
    lineCounter++;
}

for(i=0;i<4;i++)
{
  for(j=0;j<4;j++)
  printf("%d ",table[i][j]);
  printf("\n");
}
return 0;
}

Upvotes: 1

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