Added options (display, tree type...)

oper.c

@@ -44,6 +44,9 @@ static char *combine(ops, len, n)
 
     if (!res) {                                   // 1st call
         len_ops=strlen(ops);
+#       ifdef DEBUG_MEM
+        printf("mem: allocating operators working area (%d bytes)\n", len+1);
+#       endif
         res=malloc(len * sizeof(char) + 1);
     }
     for(i=0; i<len; ++i){
@@ -59,7 +62,9 @@ void gen_combinations(nops)
     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);
     for (i=0; i<n_combs; ++i) {
@@ -84,7 +89,7 @@ int main(ac, av)
 {
     char *ops="+-*/", *p;
     int len_ops=strlen(ops);
-    int i, j, nops, ncombs;
+    int i, nops, ncombs;
 
     nops=atoi(*(av+1));
     ncombs=n_combine(len_ops, nops);