C Program to Calculate the Sum of Odd & Even Numbers

This C Program calculates the sum of odd & even numbers. The program first seperates odd and even numbers. Later it adds the odd and even numbers seperately.

Here is source code of the C program to calculate the sum of odd & even numbers. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

1. /*

2.  * C program to find the sum of odd and even numbers from 1 to N

3.  */

4. #include <stdio.h>

6. void main()

7. {

8.     int i, num, odd_sum = 0, even_sum = 0;

10.     printf("Enter the value of num\n");

11.     scanf("%d", &num);

12.     for (i = 1; i <= num; i++)

13.     {

14.         if (i % 2 == 0)

15.             even_sum = even_sum + i;

16.         else

17.             odd_sum = odd_sum + i;

18.     }

19.     printf("Sum of all odd numbers  = %d\n", odd_sum);

20.     printf("Sum of all even numbers = %d\n", even_sum);

21. }

$ cc pgm12.c
$ a.out
Enter the value of num
10
Sum of all odd numbers  = 25
Sum of all even numbers = 30
 
$ a.out
Enter the value of num
100
Sum of all odd numbers  = 2500
Sum of all even numbers = 2550