normal distribution.txt

教你怎么用C++产各种各样的随机数

#include <iostream>
#include <cstdlib>
#include<ctime>
main(){
/* Generate a new random seed from system time - do this once in your constructor */
srand(time(0));

/* Setup constants */
const static int q = 15;
const static float c1 = (1 << q) - 1;
const static float c2 = ((int)(c1 / 3)) + 1;
const static float c3 = 1.f / c1;

/* random number in range 0 - 1 not including 1 */
float random = 0.f;

/* the white noise */
float noise = 0.f;

for (int i = 0; i < 10; i++)
{
    random = ((float)rand() / (float)(RAND_MAX + 1));
    noise = (2.f * ((random * c2) + (random * c2) + (random * c2)) - 3.f * (c2 - 1.f)) * c3;
    cout<<noise<<endl;
}
}