自学教程：C++ srand函数代码示例

void LevelGrid::InitializeLevel(void){    // Give the level vertices some space    this->m_LeftLevelVertices  = (hgeVector**) malloc(sizeof(hgeVector*) * this->m_NumY);    this->m_RightLevelVertices = (hgeVector**) malloc(sizeof(hgeVector*) * this->m_NumY);    // Create some storage for track indices    this->m_LeftLevelIndices  = (unsigned int*) malloc(sizeof(unsigned int) * this->m_NumY);    this->m_RightLevelIndices = (unsigned int*) malloc(sizeof(unsigned int) * this->m_NumY);    // Retrieve the list of players to generate activators    std::list<Player*> *p = this->m_PlayerManager->GetPlayers();    // Constructed the grid vertices, now build the level    for (int i = 0 ; i < this->m_NumY ; ++i)    {        // Construct the left and right vertexlist        this->m_LeftLevelVertices[i]  = this->m_GridVertices[i][StartX];        this->m_RightLevelVertices[i] = this->m_GridVertices[i][StartX + this->m_TrackWidth];        // Store indices        this->m_LeftLevelIndices[i]  = StartX;        this->m_RightLevelIndices[i] = StartX + this->m_TrackWidth;        // Only create a "turn" every 2 vertices vertical        if (i % 2 == 0)        {            int lr = rand() % 3 - 1;            if (StartX + lr < (this->m_NumX - this->m_TrackWidth) && StartX + lr > 0)            {                StartX += lr;            }        }    }    // Create a vector from the list, we need direct lookup    std::vector<Player*> players(p->begin(), p->end());        // Initialize the number of activators    this->m_NumActivators = 0;    // Only add activators whenever there are players    if (players.size() > 0)    {        // Determine the vertical distribution for activators        int verticalDistribution = this->m_NumY / (players.size() * NUM_ACTIVATORS);        // Create the activator array        this->m_Activators = (Activator**) malloc(sizeof(Activator*) * (this->m_NumActivators = NUM_ACTIVATORS * players.size()));        // This feels a bit hackish...        std::vector<std::vector<unsigned int>> activatorTypes;        for (int i = 0 ; i < players.size() ; ++i)        {            std::vector<unsigned int> activators;            for (int j = 0 ; j < NUM_ACTIVATORS ; ++j)            {                activators.push_back(j);            }            std::random_shuffle(activators.begin(), activators.end());            activatorTypes.push_back(activators);        }        std::random_shuffle(activatorTypes.begin(), activatorTypes.end());        // Retrieve viewport        unsigned int width = this->m_Engine->GetWidth();        unsigned int height = this->m_Engine->GetHeight();        // Determine deltas        float dx = width / this->m_NumX;        float dy = height / this->m_NumY;        // Define the activator length list        ACTIVATOR_LENGTH_LIST;        // Run through the players and then run though activators to make sure that        // we're never generating two activators for one player in sequence        int y = 0;        int n = 0;        std::vector<std::vector<unsigned int>>::const_iterator it;        for (int i = 0 ; i < NUM_ACTIVATORS ; ++i)        {            int k = 0;            for (it = activatorTypes.begin() ; it != activatorTypes.end() ; ++it)            {                // Fetch a random int between left and right on track y                int x = (rand() % ((this->m_RightLevelIndices[y] - 2) - (this->m_LeftLevelIndices[y] + 2))) + (this->m_LeftLevelIndices[y] + 2);                        // Fetch the activator type pointed to by i                unsigned int activatorType = (*it).at(i);                // Offset y in some direction                srand(x * y);                int offsetY = rand() % 5;                            if (y + offsetY >= this->m_NumY)                {                    y -= offsetY;                }//.........这里部分代码省略.........

int main(int argc, char **argv){    char *iFuncName;    int m, info;    int maxEvals;    int iFuncNumb, n, numIter;    int contSucess = 0;    int type;    real *x;    real epsg, epsf, epsx;    real maxiters = 0;    long fnEvals, mediaFnEvals = 0;    long gradEvals, mediaGradEvals = 0;    bool sucess;    int64_t initialTime, finalTime;    int64_t deltaTime, mediaTime = 0;    ap::real_1d_array xBFGS;    MGrasp *mgrasp;    LBFGS *lbfgs;    Funcao *func;    real *gaps;    real mediaGaps[7];    if (argc < 7) {        usage();        return 1;    }    epsg = 0.000001;    epsf = 0.000001;    epsx = 0.000001;    maxiters = 0;    iFuncName   = argv[1];    iFuncNumb   = getFuncNumb(iFuncName);    n           = atoi(argv[2]);    maxEvals    = atoi(argv[3]);    numIter     = atoi(argv[4]);    type        = getType(argv[5]);    m           = atoi(argv[6]);    if (iFuncNumb == -1) {        printf("Fun
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