C Program to Calculate the Sum of Odd & Even Numbers

#include < stdio.h>
 
void main()
{
    int i, num, odd_sum = 0, even_sum = 0;
 
    printf("Enter the value of num\n");
    scanf("%d", &num);
    for (i = 1; i <= num; i++)
    {
        if (i % 2 == 0)
            even_sum = even_sum + i;
        else
            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);
}

Output

 Enter the value of num
 10 
Sum of all odd numbers  =  25 
Sum of all even numbers =  30 
 
   
Enter the value of num
 100 
Sum of all odd numbers  =  2500 
Sum of all even numbers =  2550 

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