Computer Programming

Write the output of the following. The printed memory diagram gives a=10 at address 65510, b at address 65550 and c at address 65580; b and c value boxes are blank. What do you mean by Generic pointer, Null pointer and File pointer?

int a=10,*b,**c;
b=&a;
c=&b;
printf("%d\t%d\n",b,*c);
printf("%d\t%d\n",c,**c);
printf("%d\t%d",*b+5,&c+2);