Formatting floating point numbers(zverovich.net)

    class Time {
        uint32 m_CycleCount;
        float m_CyclesPerSec;
        float m_Time;
        
    public:
        Time() {
            m_CyclesPerSec = CPU_GetCyclesPerSec();
            m_CycleCount = CPU_GetCurCycleCount();
            m_Time = 0.0f;
        }

        float GetTime() { return m_Time; }

        void Update() {
            // note that this is expected to wrap
            // during the lifetime of the game --
            // modular math works correctly in that case
            // as long as Update() is called at least once
            // every 2^32-1 cycles.
            uint32 curCycleCount = CPU_GetCurCycleCount();
            float dt = (m_CycleCount - curCycleCount) / m_CyclesPerSec;
            m_CycleCount = curCycleCount;
            m_Time += dt;
        }
    };

    void GAME_MainLoop() {
       Timer t;
       while( !GAME_HasQuit() ) {
           t.Update();
           GAME_step( t.GetTime() );
       }
    }

    x = 1e-20 + 1e20 - 1e20
    y = 1e20 - 1e20 + 1e-20
    assert x == y

       base10  base3  base2
 1/10  yes     no     no
 1/3   no      yes    no
 1/2   yes     no     yes