Chapter 1: King Shehan miscalculated

int main()
{
    
    double t, s, v, p;
    int i, n;
    printf("  Please enter the number of cells n：");
    scanf("%d", &n);
    t = 1;
    s = 1;
    for (i = 2; i <= n; i++)
    {
    
        t = t * 2;
        s += t;

    }
    v = s / 2.4e7;
    p = v / 2.48e9;
    if (n <= 40) printf("  The total number of grains is ：%.0f\n", s);
    else printf("  The total number of grains is ：%.3e\n", s);
    printf("  The weight of wheat is about ：%f Tons of \n", v);
    printf("  It is about... Of the world's total annual grain output %.0f times \n", p);
    return 0;
	
}

result ：