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uniform.c
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uniform.c
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#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <math.h>
#include <errno.h>
#include <sys/time.h>
#define RAND() (drand48())
#define SEED(s) (srand48(s))
double Low;
double High;
int Samples;
#define Usage "uniform -c sample_count -l lower-bound -h upper-bound\n"
#define ARGS "c:h:l:"
#ifdef STANDALONE
int main(int argc, char *argv[])
{
int c;
int i;
struct timeval tm;
double value;
double r;
gettimeofday(&tm,NULL);
SEED(tm.tv_sec+tm.tv_usec);
Low = 0;
High = 1.0;
Samples = 1;
while((c = getopt(argc,argv,ARGS)) != EOF)
{
switch(c)
{
case 'l':
Low = atoi(optarg);
break;
case 'h':
High = atoi(optarg);
break;
case 'c':
Samples = atoi(optarg);
break;
default:
fprintf(stderr,"unrecognize arg: %c\n",c);
fprintf(stderr,"usage: %s\n",Usage);
fflush(stderr);
exit(1);
}
}
if(Low >= High) {
fprintf(stderr,"lower bound must be below upper bound\n");
fflush(stderr);
exit(1);
}
for(i=0; i < Samples; i++)
{
r = RAND();
value = (High - Low)*r + Low;
printf("%f\n",value);
}
fflush(stdout);
exit(0);
}
#endif