Use backtick code blocks for syntax highlighting

65-02.md

@@ -30,38 +30,40 @@ polygons, and planes are shown in Listing 65.1.
 
 **LISTING 65.1 L65\_1.h**
 
-    typedef struct {
-        double v[3];
-    } point_t;
+```c
+typedef struct {
+    double v[3];
+} point_t;
 
-    typedef struct {
-        double   x, y;
-    } point2D_t;
+typedef struct {
+    double   x, y;
+} point2D_t;
 
-    typedef struct {
-        int         color;
-        int         numverts;
-        point_t     verts[MAX_POLY_VERTS];
-    } polygon_t;
+typedef struct {
+    int         color;
+    int         numverts;
+    point_t     verts[MAX_POLY_VERTS];
+} polygon_t;
 
-    typedef struct {
-        int         color;
-        int         numverts;
-        point2D_t   verts[MAX_POLY_VERTS];
-    } polygon2D_t;
+typedef struct {
+    int         color;
+    int         numverts;
+    point2D_t   verts[MAX_POLY_VERTS];
+} polygon2D_t;
 
-    typedef struct convexobject_s {
-        struct convexobject_s   *pnext;
-        point_t                 center;
-        double                  vdist;
-        int                     numpolys;
-        polygon_t               *ppoly;
-    } convexobject_t;
+typedef struct convexobject_s {
+    struct convexobject_s   *pnext;
+    point_t                 center;
+    double                  vdist;
+    int                     numpolys;
+    polygon_t               *ppoly;
+} convexobject_t;
 
-    typedef struct {
-        double  distance;
-        point_t normal;
-    } plane_t;
+typedef struct {
+    double  distance;
+    point_t normal;
+} plane_t;
+```
 
 Given a line segment, and a plane to which to clip the segment, the
 first question is whether the segment is entirely on the inside or the