Suppression of "6 numbers" limit. New option to choose tree type.

oper.c

@@ -4,7 +4,7 @@
 #include <malloc.h>
 #include "lceb.h"
 
-static char *combs[1024]; /* should be dynamic */
+static char **combs;
 static int ncombs=0;
 
 void print_comb(n)
@@ -59,19 +59,23 @@ static char *combine(ops, len, n)
 void gen_combinations(nops)
     int nops;
 {
-    char *ops="+-*/";
+    char *ops="/-*+";
     int i, n_combs;
     int len_ops=strlen(ops);
 #   ifdef DEBUG_OPER
     printf("gen_combinations(%d)\n", nops);
 #   endif
     n_combs=n_combine(len_ops, nops);
-    //printf("gen: n=%d\n", n_combs);
+#   ifdef DEBUG_MEM
+    printf("allocating %d operators combinations\n", n_combs);
+#   endif
+    combs=malloc(sizeof (char*)*n_combs);
     for (i=0; i<n_combs; ++i) {
         combs[ncombs]=strdup(combine(ops, nops, i));
         ncombs++;
     }
 }
+
 int n_combs()
 {
     return ncombs;
@@ -87,12 +91,17 @@ int main(ac, av)
     int ac;
     char **av;
 {
-    char *ops="+-*/", *p;
+    char *ops="/-+*", *p;
     int len_ops=strlen(ops);
     int i, nops, ncombs;
 
+    if (ac!=2) {
+        fprintf(stderr, "usage: %s nops\n", *av);
+        exit (1);
+    }
     nops=atoi(*(av+1));
     ncombs=n_combine(len_ops, nops);
+    combs=malloc(sizeof (char*)*ncombs);
     printf("# operators combinations : %d\nlist = ", ncombs);
     for (i=0; i<ncombs; ++i) {
         p=combine(ops, nops, i);