int a[5], i

http://www.wretch.cc/blog/smallcircle6&article_id=17965842
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#include iostream>
#include stdlib.h>

using namespace std;

int main(int argc, char *argv[])
{
FILE *fp;
int a[5], i;

a[0] = 2;
a[1] = 4;
a[2] = 8;
a[3] = 16;
a[4] = 32;

fp = fopen("data.txt", "a+");

for (i = 1; i <= 4; i++)
{
fprintf( fp, "\tdifferencial %d\n", (a[i]-a[i-1]) );
}

fclose(fp);

printf("i = %d\n", i);
printf("&i = %d\n", &i);

printf("a = %d\n", a);
printf("*a = %d\n", *a);

system("PAUSE");
return 0;
}