积分算天数

[code]#include <stdio.h>

unsigned int MAX = 10000000;
int main()
{
    unsigned int points = 0;
    unsigned int total = 0;
    unsigned int days = 0;
    unsigned int sum = 0;
    unsigned int pay = 0;
    while (true)
    {
        printf("***************************************************\n");
        printf("input points please [points < 10,000,000]: ");
        scanf("%d", &points);
        if (0 == points)
        {
            break;
        }
        if (points > max)
        {
            printf("points should be < 10,000,000\n");
            continue;
        }
        total = 400 * points;
        days = 0;
        sum = 0;
        pay = points;
        while (total)
        {
            days++;
            total -= pay;
            sum += pay;
            pay = points - sum/400;
        }
        printf("days: %d\n", days);
    }
    return 0;
}