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

struct CONTINUATION{
    struct CONTINUATION (*FUNC)(int);
    int ARG;
};

typedef struct CONTINUATION CONT;

CONT bounce1(int arg);
CONT bounce2(int arg);
CONT bounce3(int arg);

void trampoline(CONT cont){
    if (cont.FUNC != NULL){
        trampoline(cont.FUNC(cont.ARG));
    }
}

CONT bounce3(int arg){
    CONT next;
    next.FUNC = bounce1;
    next.ARG = abs(arg) - 3;
    printf("Bounce3: %d -> %d\n", arg, next.ARG);

    return next;
}

CONT bounce2(int arg){
    CONT next;
    next.FUNC = bounce3;
    next.ARG = arg / 2;
    printf("Bounce2: %d -> %d\n", arg, next.ARG);

    return next;
}

CONT bounce1(int arg){
    CONT next;
    next.FUNC = bounce2;
    next.ARG = arg * 3;
    printf("Bounce1: %d -> %d\n", arg, next.ARG);

    if (arg * 5 == 1 || arg * 5 == 0){
        next.FUNC = NULL;
    }
    return next;
}

int main() {
    CONT init;
    init.FUNC = bounce1;
    init.ARG = 1;
    trampoline(init);
    return 0;
}