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.
* C program to find the sum of odd and even numbers from 1 to N
int i, num, odd_sum = 0, even_sum = 0;
printf("Enter the value of num\n");
for (i = 1; i <= num; i++)
if (i % 2 == 0)
even_sum = even_sum + i;
odd_sum = odd_sum + i;
printf("Sum of all odd numbers = %d\n", odd_sum);
printf("Sum of all even numbers = %d\n", even_sum);
$ 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
Sanfoundry Global Education & Learning Series – 1000 C Programs.