even or odd number v2.c

/*

    even or odd number v2.c

    With function evenNumber()

Even number is divisible by 2.

Odd isn't.

*/

#include <stdio.h>

// Returns 1 if number is even, otherwise if number is odd returns 0.
int evenNumber(int number)
{
    // Even number is divisible by 2
    if (number % 2 == 0)    // even number is divisible by 2 without rest ( rest = 0 )
        return 1;           // even number, so function return 1
    else                    // rest is not 0
        return 0;           // odd number, so function return 0
}


int main(void)
{
    int i, number, sum_of_all_numbers=0, sum_of_even_numbers=0, sum_of_odd_numbers=0;

    printf("\n Enter the number: ");
    scanf("%d", &number);

    // calculate sums
    for(i=1; i<=number; i++)    // loop for all numbers from 1 to number, including number
    {
        // sum_of_all_numbers += i;     // shortest way, it is the same as:
        sum_of_all_numbers = sum_of_all_numbers + i;

        if( evenNumber(i) )
            sum_of_even_numbers = sum_of_even_numbers + i;
        else
            sum_of_odd_numbers = sum_of_odd_numbers + i;
    }

    // Now we have sums. Let's print them:

    printf("\n Sum of all even: \n\n");

    for(i=1; i<=number; i++)    // loop for all numbers from 1 to number, including number
    {
        if( evenNumber(i) )     // if i is even
        {
            printf("%2d",i);    // print i

            if( i < number - 1) // for last even number we don't print "+"
                printf(" +");   // print "+"
        }
    }

    printf(" = %2d \n\n", sum_of_even_numbers);     // print sum


    printf("\n Sum of all odd: \n\n");

    for(i=1; i<=number; i++)    // loop for all numbers from 1 to number, including number
    {
        if( !evenNumber(i) )    // if i is not even, i is odd number
        {
            printf("%2d",i);    // print i

            if( i < number - 1 )// for last odd number we don't print "+"
                printf(" +");   // print "+"
        }
    }

    printf(" = %2d \n\n", sum_of_odd_numbers);      // print sum


    printf("\n Sum of all numbers: \n\n");

    for(i=1; i<=number; i++)    // loop for all numbers from 1 to number, including number
    {
        printf("%2d",i);        // print i

        if( i < number )    // for last number we don't print "+"
            printf(" +");   // print "+"
    }

    printf(" = %2d \n\n", sum_of_all_numbers);      // print sum


    printf("\n");

    return 0;
}