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

int main()
{
    double gamma, a = 8.9;
    double alpha;
    double dx = 6;

    for (alpha = 35; alpha < 50; alpha += dx)
        gamma = a * pow (sin (alpha + M_PI/10), 2) / (log(a) - cos (alpha / 3));

    printf ("for: %f", gamma);


    alpha = 35;
    while (alpha < 50)
    {
        gamma = a * pow (sin (alpha + M_PI/10), 2) / (log(a) - cos (alpha / 3));
        alpha += dx;
    }

    printf ("\nwhile: %f", gamma);


    alpha = 35;
    do
    {
        gamma = a * pow (sin (alpha + M_PI/10), 2) / (log(a) - cos (alpha / 3));
        alpha += dx;
    } while (alpha < 50);

    printf ("\ndo while: %f", gamma);

    return 0;
}