C++产生随机数

[ClareTung]

C++产生随机数，指定在 0.000001 - 1之间，求源程序代码

[ClareTung]

#include <stdio.h>
#include <stdlib.h>
#include<iostream>
#include <time.h>
unsigned long ulrand(void) {
return (
(((unsigned long)rand()<<24)&0xFF000000ul)
|(((unsigned long)rand()<<12)&0x00FFF000ul)
|(((unsigned long)rand() )&0x00000FFFul));
}
int i;
unsigned long ul;
int main() {
srand(time(NULL));
for (i=0;i<1000;i++) {
ul=ulrand();
double num=(ul%1000000000)/1000000000.0;
if(num>0.00000454){
std::cout<<num<<std::endl;
}
}
return 0;
}

[hongss]

//产生一个[M, N]区间上的随机数  
int my_rand(int M,int N)    
{    
    return (int)((double)rand()/(double)RAND_MAX*(N-M+1)+M);    
}

增添部分代码就可以实现你的要求