Added book examples

C9/do_while_loop.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+	int age;		// Declare variable, no need to initialise this time 
+					// as we read into it before it is tested against
+    
+    // The loop is always entered as the test is at the end
+    do 
+    {
+        // Code must be executed at least once
+        printf ("\nPlease enter your age");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);    
+        
+        // Test is now made and the code 
+        // repeats if the test equates as non-zerp
+        // (i.e. is age is not zero)
+    }
+    while ( age != 0);
+    
+    return 0;
+}

C9/for_loop_examples.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Ddeclare variable and initialise to 1
+    int i;
+
+    // Count up from 1 to 100 in steps of 1
+    // Note the test could also be: i <= 100
+    for ( i = 0 ; i < 101 ; i++ )
+    {
+        printf ("The value of i is %d\n",i);
+    }
+
+    // Count down form 10 to zero
+    // Note: we could also use the test: i != 0
+    for ( i = 10 ; i >= 0 ; i-- )
+    {
+        printf ("The value of i is %d\n",i);
+    }
+
+    // Count up from 1 to 100 in steps of 3
+    // Note the test could also be: i <= 100
+    // Increement could also be written as i+=3
+    for ( i = 0 ; i < 101 ; i=i+1 )
+    {
+        printf ("The value of i is %d\n",i);
+    }
+    return 0;
+}

C9/infinite_while_loop.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+	int age ;  	// Declare variable, no need to initialise this time 
+				// as the test condition is not based on its value
+    
+    // This is always non-zero, the loop will never break
+    while ( 1 )
+    {
+        // Code in {} executed if condition is true (non-zero)
+        
+        printf ("\nPlease enter your age");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);    
+        
+        // Code  now goes back and repeats 
+        // as the conditions is always non-zero (true)
+    }
+    
+    return 0;	// Exit code
+}

C9/while_loop.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+   	int age = 1;  			// Declare variable and initialise to 1
+    
+    while ( age != 0)	    // Loop as long as age is not zero
+    {
+        // Code in {} executed if condition is true (non-zero)
+        
+        printf ("\nPlease enter your age");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);    
+        
+        // Code  now goes back and repeats the test with the value of age just entered
+    }
+    return 0;	// Exit code
+}