Use backtick code blocks for syntax highlighting

01-02.md

@@ -82,46 +82,48 @@ It's *slow*.
 
 **LISTING 1.1 L1-1.C**
 
-    /*
-    * Program to calculate the 16-bit checksum of all bytes in the
-    * specified file. Obtains the bytes one at a time via read(),
-    * letting DOS perform all data buffering.
-    */
-    #include <stdio.h>
-    #include <fcntl.h>
+```c
+/*
+* Program to calculate the 16-bit checksum of all bytes in the
+* specified file. Obtains the bytes one at a time via read(),
+* letting DOS perform all data buffering.
+*/
+#include <stdio.h>
+#include <fcntl.h>
 
-    main(int argc, char *argv[]) {
-         int Handle;
-         unsigned char Byte;
-         unsigned int Checksum;
-         int ReadLength;
+main(int argc, char *argv[]) {
+     int Handle;
+     unsigned char Byte;
+     unsigned int Checksum;
+     int ReadLength;
 
-         if ( argc != 2 ) {
-              printf("usage: checksum filename\n");
-              exit(1);
-         }
-         if ( (Handle = open(argv[1], O_RDONLY | O_BINARY)) == -1 ) {
-              printf("Can't open file: %s\n", argv[1]);
-              exit(1);
-         }
+     if ( argc != 2 ) {
+          printf("usage: checksum filename\n");
+          exit(1);
+     }
+     if ( (Handle = open(argv[1], O_RDONLY | O_BINARY)) == -1 ) {
+          printf("Can't open file: %s\n", argv[1]);
+          exit(1);
+     }
 
-         /* Initialize the checksum accumulator */
-         Checksum = 0;
+     /* Initialize the checksum accumulator */
+     Checksum = 0;
 
-         /* Add each byte in turn into the checksum accumulator */
-         while ( (ReadLength = read(Handle, &Byte, sizeof(Byte))) > 0 ) {
-              Checksum += (unsigned int) Byte;
-         }
-         if ( ReadLength == -1 ) {
-              printf("Error reading file %s\n", argv[1]);
-              exit(1);
-         }
+     /* Add each byte in turn into the checksum accumulator */
+     while ( (ReadLength = read(Handle, &Byte, sizeof(Byte))) > 0 ) {
+          Checksum += (unsigned int) Byte;
+     }
+     if ( ReadLength == -1 ) {
+          printf("Error reading file %s\n", argv[1]);
+          exit(1);
+     }
 
 
-         /* Report the result */
-         printf("The checksum is: %u\n", Checksum);
-         exit(0);
-    }
+     /* Report the result */
+     printf("The checksum is: %u\n", Checksum);
+     exit(0);
+}
+```
 
 Table 1.1 shows the time taken for Listing 1.1 to generate a checksum of
 the WordPerfect version 4.2 thesaurus file, TH.WP (362,293 bytes in