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	troll.c - rpgtools - various tools for role-playing games
	git clone git://src.adamsgaard.dk/rpgtools
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	troll.c (782B)
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	1 #include <stdio.h>
	2 #include <stdlib.h>
	3 #include <err.h>
	4 #include <math.h>
	5
	6 char *argv0;
	7
	8 void
	9 usage(void)
	10 {
	11 errx(1, "usage: %s DICE\nwhere DICE is N dice with M sides, in f…
	12 }
	13
	14 int
	15 random_number(int min, int max)
	16 {
	17 return min + round((double)rand() / RAND_MAX * (double)(max - mi…
	18 }
	19
	20 int
	21 main(int argc, char *argv[])
	22 {
	23 int i, n, sides, roll, sum = 0;
	24
	25 argv0 = *argv;
	26 if (argc != 2)
	27 usage();
	28
	29 sscanf(argv[1], "%dd%d", &n, &sides);
	30
	31 if (n < 1)
	32 errx(1, "number of dice must be a positive value (%d)", …
	33
	34 if (sides < 2)
	35 errx(1, "dice must be at least two sided (%d)", sides);
	36
	37 for (i = 0; i < n; i++) {
	38 roll = random_number(1, sides);
	39 printf("1d%d\t%d\n", sides, roll);
	40 sum += roll;
	41 }
	42
	43 if (n > 1)
	44 printf("SUM:\t%d\n", sum);
	45
	46 return 0;
	47 }