Help in Output

[ashlee]

My friend questioned me the output of the below program

#include <stdio.h>
main()
{
int a[] = { 1, 4, 8, 5, 1, 4 };
int *s,b;
s = a + 4;
b = s - a;
printf("%d",b);
}

I told the output as 8.But he told me its wrong and asked me to try. Kindly someone help me to solve this problem.

[Adrian]

Yes as your friend said your answer was wrong. The output is 4.Its simple. Consider the base address or starting address of a as 1000. So you would have 1000+4=1004 stored in s and again
b=s-a
gives
b=1004-1000=4 and b is outputted which gives the output as 4.