urand[0,1) test

urandtest.c

#include<stdio.h>
#include<stdlib.h>
#define FMAX 12
#define RNUM 10000

double randnnA(int ir)
{
	return ir / (RAND_MAX + 1);
}

double randnnB(int ir)
{
	return ir / (RAND_MAX + 1.0);
}

double randndA(int ir)
{
	return ir / (double)(RAND_MAX + 1);
}

double randndB(int ir)
{
	return ir / (double)(RAND_MAX + 1.0);
}

double randndC(int ir)
{
	return ir / ((double)RAND_MAX + 1);
}

double randndD(int ir)
{
	return ir / ((double)RAND_MAX + 1.0);
}

double randdnA(int ir)
{
	return (double)ir / (RAND_MAX + 1);
}

double randdnB(int ir)
{
	return (double)ir / (RAND_MAX + 1.0);
}

double randddA(int ir)
{
	return (double)ir / (double)(RAND_MAX + 1);
}

double randddB(int ir)
{
	return (double)ir / (double)(RAND_MAX + 1.0);
}

double randddC(int ir)
{
	return (double)ir / ((double)RAND_MAX + 1);
}

double randddD(int ir)
{
	return (double)ir / ((double)RAND_MAX + 1.0);
}

int main()
{
	int i = 0;
	int f = 0;
	int num = RNUM;
	int ir = 0;
	double (*func[FMAX]) (int ir) = {
	randnnA, randnnB, randndA, randndB, randndC, randndD,
	randdnA, randdnB, randddA, randddB, randddC, randddD
	};
	char *name[FMAX] = {
		"randnnA",
		"randnnB",
		"randndA",
		"randndB",
		"randndC",
		"randndD",
		"randdnA",
		"randdnB",
		"randddA",
		"randddB",
		"randddC",
		"randddD"
	};

	double max[FMAX], min[FMAX], g[FMAX];
	srand(0);
	for (f = 0; f < FMAX; f++) {
		min[f] = func[f] (0);
		max[f] = func[f] (RAND_MAX);
	}
	printf("set 0 and RAND_MAX\n");
	for (f = 0; f < FMAX; f++)
		printf("%s min:%.16lg \t max:%.16lg \n", name[f], min[f],
		       max[f]);
	printf("\ngenerate random number %d times\n", num);
	for (f = 0; f < FMAX; f++) {
		g[f] = func[f] (rand());
		max[f] = g[f];
		min[f] = g[f];
	}
	for (i = 1; i < num; i++) {
		for (f = 0; f < FMAX; f++) {
			g[f] = func[f] (rand());
			if (max[f] < g[f])
				max[f] = g[f];
			if (min[f] > g[f])
				min[f] = g[f];
		}
	}
	for (f = 0; f < FMAX; f++)
		printf("%s min:%.16lg \t max:%.16lg \n", name[f], min[f],
		       max[f]);
	return 1;
}

g[f]は配列にする必要なかったですね。あと乱数の部分はdefineマクロでも良かったか。