Question

For my homework, I have to read data from an input file and to store it in a double dimensional array and then pass this array to another function. This is what I have tried so far, but I don’t know when I call this function in main it gives the error:

Access violation writing location 0x00000000.

I have tried to dynamically allocate memory and it gives the same error. What I am doing wrong?

The last update of the code:

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

int *a[2];
void getData(void)
{
    FILE *fp = fopen("input.txt", "r");
    int number;

    fscanf(fp, "%d", &number);


    for (int i = 0; i < number; i++)
    {
        a[i]=(int*)malloc(number * sizeof (int));
        fscanf(fp, "%d %d", &a[i][0], &a[i][1]);
    }
    fclose(fp);
}


int main()
{   
    getData();
    for(int i=0;i<8;i++)
    {
        printf("%d %d\n",a[i][0],a[i][1]);
    }
}

Answer 1

You need to allocate memory for a

Before the for loop

a = (int **)malloc(number * sizeof(int *))