Write a function that return sum of all the odd digits of a given positive no entered through keyboard.

Dr. A.P.J. Abdul Kalam Technical University, Lucknow

KCS151 / KCS251 Programming for Problem Solving - Using C Language

Lab Exercises

15. Write a function that returns the sum of all the odd digits of a given positive no entered through the keyboard.

/*

 File: Prgrm15.c

 Author: Aditya Saini

 Date: Jan 17, 2021

 Description: Function that returns the sum of all the odd digits of a given positive no entered
 through keyboard.

*/

#include <stdio.h>

#include <math.h>

int my_fun (int);

int main (void)

{

     int num;

     int sum;

     //Input number

     printf ("Input number: ");

     scanf ("%d", &num);

     //Function call

     sum = my_fun (num);

     //Print result

     printf ("Sum of odd digits: %d", sum);

     return 0;

};

int my_fun (int num)

{

     int sum_1, sum_2;

     int num_of_digits;

     //Calculate sum

     num_of_digits = 0;

     sum_1 = sum_2 = 0;

     while (num != 0)

     {

          if (num_of_digits % 2 == 0)

               sum_1 = sum_1 + num % 10;

          else

               sum_2 = sum_2 + num % 10;

          num_of_digits++;

          num = num / 10;

     }

     //Return sum

     if (num_of_digits %2 == 0)

          return sum_2;

     else

          return sum_1;

};

Output

Input number: 12345

Sum of odd digits: 9