#include <stdio.h>

void printS(char *str)
{
    puts(str);
}

void printF(float *f)
{
    printf("%f\n", *f);
}

struct GLFrame
{
    int x, y, z;
    void (*func1)(char *);
    void (*func2)(struct GLFrame *, int *, int *, int *);
};

void modPos(struct GLFrame *frame, int *x, int *y, int *z)
{
    frame->x = *x;
    frame->y = *y;
    frame->z = *z;
}

struct GLFrame frame = {
    .x = 5,
    .y = 6,
    .z = 7,
    .func1 = printS,
    .func2 = modPos
};

int main(void)
{
#if 0
    float x = 1.0f;
    printf("x in hex: 0x%016x\n", x);
#endif

    int x, y, z;
    x = y = z = 3;
    /* i want to modify position vector, xyz */
    frame.func2(&frame, &x, &y, &z);

    printf("x is: %d\ny is: %d\nz is: %d\n", frame.x, frame.y, frame.z);

    puts("Hello");

    return 0;
}