gistfile1.txt

#include <stdio.h>
#include <math.h>

int main()
{
        double x = 0.5;

        printf("orig\tround\tfloor\tceil\n");
        printf("%.2f\t%.2f\t%.2f\t%.2f\n", x, round(x), floor(x), ceil(x));

        return 0;
}

orig round floor ceil
0.40 0.00 0.00 1.00
0.50 1.00 0.00 1.00
0.60 1.00 0.00 1.00