state_machine.c

#include <stdio.h>
 
void *stateStart();
void *state1();
void *state2();
void *stateEnd();
 
int main()
{
    printf("StateMachine Demo\n");
    void* (*state_func_p)();// pointer to function returning pointer to next function
    state_func_p = stateStart; // init state
 
    while(state_func_p)
    {
        state_func_p = state_func_p();
    }
    return 0;
}
 
void *stateStart()
{
    printf("State0\n");
    return state1;
}
 
void *state1()
{
    printf("State1\n");
    return state2;
}
 
void *state2()
{
    printf("State2\n");
    return stateEnd;
}
 
void *stateEnd()
{
    printf("State3\n");
    return 0;
}