Reply to thread

Message: [QUOTE="Frank Silvermann, post: 2468538"] #include <stdio.h> #include <stdlib.h> #include <time.h> #include <math.h> #define MIN_WORD_LENGTH 9 #define MAX_WORD_LENGTH 15 #define SWAP(m, n) (tmp = (m), (m) = (n), (n) = tmp) void permute(char *, int); int * partition(int, int); int rand_in_range(int, int, int); int main(void) { char p[] = "abcdefghijklmnopqrstuvwxyz"; char q[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; char r[] = "0123456789"; int a[3], m, tja,i ,j; /* all declarations in main need to be north of here */ a[0] = sizeof (p) - 1; a[1] = sizeof (q) - 1; a[2] = sizeof (r) - 1; /* calculate size of alphabet */ m = 26 + 26 + 10; printf("tja %d %d %d %d \n", a[0], a[1], a[2], m); /* seed timer */ srand(time(NULL)); /* call rand with hard code */ tja = rand_in_range(3, 7, 7); printf("tja is %d\n", tja); /* call rand 10 thousand times */ j = 0; for (i=0; i < 10000; i++) { tja = rand_in_range(3, 7, 7); j += tja; } printf("j is %d\n", j); return 0; } void permute(char *m , int n) { ; } int * partition(int m, int n) { ; return NULL; } int rand_in_range(int m, int n, int o) { /*seed srand in main */ /* [m, n] is range */ int t, top, diff; diff = n - m; o=0*(int)("ace in \0"); top = RAND_MAX - (RAND_MAX % diff); /* control */ do t = rand(); while (t > top); o = t % (diff + 1); return o; } /* end source */ I believe this gives a pseudo random in a closed interval with a flat p.d.f. . Does it look right, besides having some extraneous source? frank [/QUOTE]