4. [Functions and Loops] The function int reverse_num(int) returns the reverse of the number that has been passed to it. For example, on passing 743, reverse_num should return 347. Your task is to complete the reverse_num function. [4 points] int reverse_num(int num) \{ int rev_num =0; int remainder =0; while (num !=0){ remainder = rev_num = num = \} return rev_num