diff --git a/src/apply.c b/src/apply.c
index edb349ed2..a7875da6d 100644
--- a/src/apply.c
+++ b/src/apply.c
@@ -3124,7 +3124,7 @@ use_whip(struct obj *obj)
 
                         hitvalu = 8 + otmp->spe;
                         hitu = thitu(hitvalu, dmgval(otmp, &gy.youmonst),
-                                     &otmp, (char *)0);
+                                     &otmp, (char *) 0);
                         if (hitu) {
                             pline_The("%s hits you as you try to snatch it!",
                                       the(onambuf));
diff --git a/src/artifact.c b/src/artifact.c
index 5a557541e..f15efdc5c 100644
--- a/src/artifact.c
+++ b/src/artifact.c
@@ -137,7 +137,7 @@ artiname(int artinum)
    into an artifact of matching type, or returned as-is if that's not
    possible.
    For the 2nd case, caller should use ``obj = mk_artifact(obj, A_NONE);''
-   for the 1st, ``obj = mk_artifact((struct obj *)0, some_alignment);''.
+   for the 1st, ``obj = mk_artifact((struct obj *) 0, some_alignment);''.
  */
 struct obj *
 mk_artifact(
diff --git a/src/botl.c b/src/botl.c
index c5132dc85..1d3082517 100644
--- a/src/botl.c
+++ b/src/botl.c
@@ -3765,7 +3765,7 @@ status_hilite_menu_add(int origfld)
         if (initblstats[fld].anytype != ANY_STR) {
             boolean ltok = (fld != BL_TIME), gtok = TRUE;
 
-            lt_gt_eq = status_hilite_menu_choose_updownboth(fld, (char *)0,
+            lt_gt_eq = status_hilite_menu_choose_updownboth(fld, (char *) 0,
                                                             ltok, gtok);
             if (lt_gt_eq == NO_LTEQGT)
                 goto choose_behavior;
diff --git a/src/dig.c b/src/dig.c
index 45e228676..d78098f9f 100644
--- a/src/dig.c
+++ b/src/dig.c
@@ -2129,7 +2129,7 @@ escape_tomb(void)
                 surface(u.ux, u.uy));
 
             good = (tunnels(gy.youmonst.data) && !needspick(gy.youmonst.data))
-                      ? dighole(TRUE, FALSE, (coord *)0) : TRUE;
+                      ? dighole(TRUE, FALSE, (coord *) 0) : TRUE;
             if (good)
                 unearth_you();
         }
diff --git a/src/do_wear.c b/src/do_wear.c
index 360db9579..a02b038e8 100644
--- a/src/do_wear.c
+++ b/src/do_wear.c
@@ -1522,7 +1522,7 @@ cancel_doff(struct obj *obj, long slotmask)
 {
     /* Called by setworn() for old item in specified slot or by setnotworn()
      * for specified item.  We don't want to call cancel_don() if we got
-     * here via <X>_off() -> setworn((struct obj *)0) -> cancel_doff()
+     * here via <X>_off() -> setworn((struct obj *) 0) -> cancel_doff()
      * because that would stop the 'A' command from continuing with next
      * selected item.  So do_takeoff() sets a flag in takeoff.mask for us.
      * [For taking off an individual item with 'T'/'R'/'w-', it doesn't
diff --git a/src/dungeon.c b/src/dungeon.c
index b990b362b..8e3b7e80b 100644
--- a/src/dungeon.c
+++ b/src/dungeon.c
@@ -2667,7 +2667,7 @@ query_annotation(d_level *lev)
 int
 donamelevel(void)
 {
-    query_annotation((d_level *)0);
+    query_annotation((d_level *) 0);
     return ECMD_OK;
 }
 
@@ -2760,7 +2760,7 @@ find_mapseen_by_str(const char *s)
 void
 rm_mapseen(int ledger_num)
 {
-    mapseen *mptr, *mprev = (mapseen *)0;
+    mapseen *mptr, *mprev = (mapseen *) 0;
     struct cemetery *bp, *bpnext;
 
     for (mptr = gm.mapseenchn; mptr; mprev = mptr, mptr = mptr->next)
@@ -3393,7 +3393,7 @@ show_overview(
     /* if game is over or we're not in the endgame yet, show the dungeon */
     if (why != 0 || !In_endgame(&u.uz))
         traverse_mapseenchn(0, win, why, reason, &lastdun);
-    end_menu(win, (char *)0);
+    end_menu(win, (char *) 0);
     n = select_menu(win, (why != -1) ? PICK_NONE : PICK_ONE, &selected);
     if (n > 0) {
         int ledger;
diff --git a/src/files.c b/src/files.c
index 783ea1eee..007809c71 100644
--- a/src/files.c
+++ b/src/files.c
@@ -504,9 +504,9 @@ zero_nhfile(NHFILE *nhfp)
         nhfp->fieldlevel = FALSE;
         nhfp->addinfo = FALSE;
         nhfp->bendian = IS_BIGENDIAN();
-        nhfp->fpdef = (FILE *)0;
-        nhfp->fplog = (FILE *)0;
-        nhfp->fpdebug = (FILE *)0;
+        nhfp->fpdef = (FILE *) 0;
+        nhfp->fplog = (FILE *) 0;
+        nhfp->fpdebug = (FILE *) 0;
         nhfp->count = 0;
         nhfp->eof = FALSE;
         nhfp->fnidx = 0;
@@ -1202,7 +1202,7 @@ restore_saved_game(void)
     if ((nhfp = open_savefile()) != 0) {
         if (validate(nhfp, fq_save, FALSE) != 0) {
             close_nhfile(nhfp);
-            nhfp = (NHFILE *)0;
+            nhfp = (NHFILE *) 0;
             (void) delete_savefile();
         }
     }
diff --git a/src/hack.c b/src/hack.c
index 9eb1aa791..6eb1101ab 100644
--- a/src/hack.c
+++ b/src/hack.c
@@ -1809,7 +1809,7 @@ domove_fight_ironbars(coordxy x, coordxy y)
             if (obj->quan > 1L)
                 obj = splitobj(obj, 1L);
             else
-                setuwep((struct obj *)0);
+                setuwep((struct obj *) 0);
             freeinv(obj);
             breakflags |= BRK_KNOWN2BREAK;
         } else {
diff --git a/src/mthrowu.c b/src/mthrowu.c
index e1aec8426..bafb3c8c6 100644
--- a/src/mthrowu.c
+++ b/src/mthrowu.c
@@ -859,7 +859,7 @@ spitmm(struct monst* mtmp, struct attack* mattk, struct monst* mtarg)
                 gm.mtarget = mtarg;
             m_throw(mtmp, mtmp->mx, mtmp->my, sgn(gt.tbx), sgn(gt.tby),
                     distmin(mtmp->mx,mtmp->my,tx,ty), otmp);
-            gm.mtarget = (struct monst *)0;
+            gm.mtarget = (struct monst *) 0;
             nomul(0);
 
             /* If this is a pet, it'll get hungry. Minions and
diff --git a/src/pager.c b/src/pager.c
index c79c8a88b..d9164f668 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -1473,7 +1473,7 @@ do_screen_description(
 
  didlook:
     if (looked) {
-        struct permonst *pm = (struct permonst *)0;
+        struct permonst *pm = (struct permonst *) 0;
 
         if (found > 1 || need_to_look) {
             char monbuf[BUFSZ];
diff --git a/src/sp_lev.c b/src/sp_lev.c
index f3903f7a5..3f08fa54e 100644
--- a/src/sp_lev.c
+++ b/src/sp_lev.c
@@ -341,7 +341,7 @@ map_cleanup(void)
                 /* in case any boulders are on liquid, delete them */
                 while ((otmp = sobj_at(BOULDER, x, y)) != 0) {
                     obj_extract_self(otmp);
-                    obfree(otmp, (struct obj *)0);
+                    obfree(otmp, (struct obj *) 0);
                 }
 
                 /* traps on liquid? */
diff --git a/src/sys.c b/src/sys.c
index d1f9e0b51..7f463c50d 100644
--- a/src/sys.c
+++ b/src/sys.c
@@ -107,7 +107,7 @@ sysopt_release(void)
         sysopt.debugfiles = (char *) 0;
 #ifdef DUMPLOG
     if (sysopt.dumplogfile)
-        free((genericptr_t)sysopt.dumplogfile), sysopt.dumplogfile=(char *)0;
+        free((genericptr_t) sysopt.dumplogfile), sysopt.dumplogfile=(char *) 0;
 #endif
     if (sysopt.genericusers)
         free((genericptr_t) sysopt.genericusers),