c - error: invalid operands to binary * (have ‘int *’ and ‘int’)

Question

I am trying to convert a number in IP address using pointers in C.

for example: IP = 3229305093 192.123.73.5

and the error i have is:

error: invalid operands to binary * (have ‘int *’ and ‘int’)
bytes[i] = (*ip1 >> (int )i8) & 0xFF;

Here is my function:

void print_ip(int* ip1) {
unsigned char bytes[4];
int i;

for(i=0; i<4; i++) {
  bytes[i] = (*ip1 >> (int *)i*8) & 0xFF;
}

printf("%d.%d.%d.%d
", bytes[3], bytes[2], bytes[1], bytes[0]);

}

Answer 1

Both operators of bit-shift operator >> should be integers. The extra cast should be removed.

Wrong:

  bytes[i] = (*ip1 >> (int *)i*8) & 0xFF;

Correct:

  bytes[i] = (*ip1 >> i*8) & 0xFF;