HomeWork

#include<stdio.h>

int sumOfDigits(int x);
int sumOfDigitsFrom1ToN(int n);

int sumOfDigitsFrom1ToN(int n)
{
    int result = 0;

    for (int x = 1; x <= n; x++)
        result += sumOfDigits(x);

    return result;
}

int sumOfDigits(int x)
{
    int sum = 0;
    while (x != 0)
    {
        sum += x %10;
        x   = x /10;
    }
    return sum;
}

int main()
{
    int n = 328;
     printf(" %d: %d",n,sumOfDigitsFrom1ToN(n));
    return 0;
}