Use backtick code blocks for syntax highlighting

01-04.md

@@ -20,39 +20,41 @@ libraries do their work. In other words, *know the territory*!
 
 **LISTING 1.4 L1-4.C**
 
-    /*
-    * Program to calculate the 16-bit checksum of the stream of bytes
-    * from the specified file. Obtains the bytes one at a time via
-    * getc(), allowing C to perform data buffering.
-    */
-    #include <stdio.h>
+```c
+/*
+* Program to calculate the 16-bit checksum of the stream of bytes
+* from the specified file. Obtains the bytes one at a time via
+* getc(), allowing C to perform data buffering.
+*/
+#include <stdio.h>
 
-    main(int argc, char *argv[]) {
-          FILE *CheckFile;
-          int Byte;
-          unsigned int Checksum;
+main(int argc, char *argv[]) {
+      FILE *CheckFile;
+      int Byte;
+      unsigned int Checksum;
 
-          if ( argc != 2 ) {
-                printf("usage: checksum filename\n");
-                exit(1);
-          }
-          if ( (CheckFile = fopen(argv[1], "rb")) == NULL ) {
-                printf("Can't open file: %s\n", argv[1]);
-                exit(1);
-          }
+      if ( argc != 2 ) {
+            printf("usage: checksum filename\n");
+            exit(1);
+      }
+      if ( (CheckFile = fopen(argv[1], "rb")) == NULL ) {
+            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 ( (Byte = getc(CheckFile)) != EOF ) {
-                Checksum += (unsigned int) Byte;
-          }
+      /* Add each byte in turn into the checksum accumulator */
+      while ( (Byte = getc(CheckFile)) != EOF ) {
+            Checksum += (unsigned int) Byte;
+      }
 
-          /* Report the result */
-          printf("The checksum is: %u\n", Checksum);
-          exit(0);
-    }
+      /* Report the result */
+      printf("The checksum is: %u\n", Checksum);
+      exit(0);
+}
+```
 
 #### Know When It Matters {#Heading10}