C program to calculate the sum of odd and even numbers
#include <stdio.h>void main(){int i, number, odd_sum = 0, even_sum = 0;printf("Enter the value of numbern");scanf("%d", &number);for (i = 1; i <= number; i++){if (i % 2 == 0)even_sum = even_sum + i;elseodd_sum = odd_sum + i;}printf("Sum of all odd numbers = %dn", odd_sum);printf("Sum of all even numbers = %dn", even_sum);}