Round to specific number

#include <stdio.h>

int round_to(int original, int to)
{
    int mod = original % to;
    float to_half = to / 2.0f;

    if (mod < to_half)
    {
        return original - mod;
    }
    else
    {
        return original + (to - mod);
    }
}

int main()
{
    int i;

    for (i = 0; i < 30; i++)
    {
        printf("%d -> %d\n", i, round_to(i, 5));
    }

    return 0;
}