#include <iostream>
#include <math.h>
double rand01();

int main()
{
    double r;

   for( int i = 0; i < 10; i++ )
      {
          std::cout <<rand01()<<std::endl;
          }
     return(0);
}

double rand01()
{
  double r = ( (double)rand() / ((double)(RAND_MAX)+(double)(1)) );

     return r;
}


$ ./a.exe
0 : 0
1 : 0.690001
2 : 0.505418
3 : 0.591491
4 : 0.554785
5 : 0.378429
6 : 0.257732
7 : 0.207382
8 : 0.626262
9 : 0.340127