Garbage Value Output

[Ralph]

I have my C program as below:

void main()
{
int testarray[2]={1,2};
int *ar = &testarray[-1];
int j;
for(j=0;j<2;j++)
{
printf("\t%d",*ar);
ar++;
}
}

When I run the above program it gives some garbage value. Can anyone tell me why I get garbage value as output for the above program?

[ashlee]

You get some garbage value as output because the array in C programming starts at index 0 and in the statement
int *ar = &testarray[-1];

The address of testarray[-1] is stored in the ar and the contents when it is printed in the output statement gives a garbage value.