Added book examples

C8/if_example.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Declare some variables
+    int  a = 7, b=6;
+
+	// A single line of code conditional on the value of a
+	if ( a == 7 )
+	   printf ("The value of a is 7 - so I will do this\n");    
+	   
+	// Multiple lines of code conditional on b not equalling 4
+	// so then need to be placed inside { and }
+	if ( b != 4 )
+	{
+	   printf ("The value of b is not 4\n");    
+	   printf ("So I will do multiple tasks\n");    
+	}
+	   
+    return 0;   // Exit from main
+}