c++ 伪随机数生成

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#include <ctime>

#include <cstdlib>

using namespace std;

 

static unsigned int g_seed = 0;

 

void seedrand(int seed) {

    g_seed = seed;

}

 

 

int rand(int xmin,int xmax) {

    if(xmin>xmax)

        throw "Invalid arguments!";

 

    if(g_seed==0)

        seedrand((unsigned)time(0));

    g_seed = 214013 * g_seed + 2531011;

    return (g_seed ^ g_seed >> 15)%(xmax-xmin+1)+xmin;

}