This program segment given below uses a straight-forward approach to count the number of odd and even digits in a given integer number (number).

Initially, variables n odd and n even, the counts for odd and even digits, respectively, are initialized to zero. Then a while loop is used to count the odd and even digits. In each iteration of this loop, the least significant digit of number number is first determined in variable digit,then the appropriate counter is incremented using an if-else statement and the least significant digit is removed from number number. The loop is executed as long as the value of number is greater than zero, i. e., all digits in number are not processed. Finally, the values of n odd and never are printed.

#include <stdio.h>

void main()

{    

      int n odd, n even, num,digit ;  

      clr scr ();

      print f("Count number of odd and even digits in a given integer number ");

      scan f("%d",& num);

               n odd = n even =0; /* count of odd and even digits */

               while ( num> 0)

                   {

                       digit = num % 10; /* separate LS digit from number */

                       if (digit % 2 == 1)

                          nodd++;

                       else n even++;

                              num /= 10; /* remove LS digit from num */

                   }

                       print f("Odd digits : %d Even digits: %d\n", n odd, n even);

                       getch (); }