Trouble with pointers

[eternities_end]

Hello everyone
I am new to C and I am having a few problems with pointers. It wouuld be nice if someone could help me out
This is what I am trying to do

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

int main(void)
{
	int n,i,j;
	int a[3][4],**Trial=NULL;
	Trial = (int **)malloc(3*sizeof(int*));
	for(i=0;i<3;i++)
	{
		*(Trial+i) = (int*)malloc(4*sizeof(int));
	}
	for(i=0;i<3;i++)
	{
		for(j=0;j<3;j++)
		{
			printf("Enter the %d,%d coefficient\n",i,j);
			scanf("%d",&Trial[i][j]);
		}
		printf("Enter the result of the equation\n");
		scanf("%d",&Trial[i][3]);
	}
	for(i=0;i<3;i++)
	{
		for(j=0;j<4;j++)
		{
			printf("The value at position (%d,%d) is %d\n",i,j,Trial[i][j]);
		}
	}
	return 0;
}

This program works fine as long as I do not use pointer arithmetic
but when I use pointer arithmetic I keep getting a segemntation fault
I replace the

 scanf("%d",&Trial[i][j]);

with

 scanf("%d",*(Trial+(i+j)));

and I get a segmentation fault after the first outer loop.
Can someone please tell me what I am doing wrong
Thanks

[prasath]

In scanf function,Each argument must be a pointer to a variable of a type that corresponds to a type specifier in format.

*(Trial+(i+j)) dereferences and fetch the value at that address.

scanf("%d",*(Trial+(i+j)));

look into this
http://computer.howstuffworks.com/c7.htm

[Salem]

> Trial = (int **)malloc(3*sizeof(int*));
read the FAQ

>

[cwr]

 scanf("%d",&Trial[i][j]);

with

 scanf("%d",*(Trial+(i+j)));

and I get a segmentation fault after the first outer loop.
Can someone please tell me what I am doing wrong
Thanks

Those are not the same. Trial[i][j] is equivalent to *(*(Trial+i)+j).