Initial commit of lecture code

LC9/do_while_example.c

@@ -0,0 +1,42 @@
+/*
+   This program shows how to use a DO/WHILE statement to keep displaying
+   the key pressed on the screen. It terminates when the 'q' key is
+   pressed
+
+   James Bonnyman	
+*/
+
+#include <stdio.h>	/* Standard include files */
+#include <stdlib.h>
+#include <conio.h>
+
+int main(void)
+{
+
+  char x;		/* Define a variable of type char */
+
+
+  /* We now use the while statement. The 'loop' continues to execute */
+  /* until such time as the expression in the brackets becomes false */
+
+  /* we use != , meaning 'Not Equal to' as the test, as we wish the  */
+  /* the statements to be executed every time we press a key other   */
+  /* than 'q'. Once we press 'q' the code continues on to the next   */
+  /* statement */
+
+  /* Note: This time the getch is in the while expression  */
+
+
+  do
+  {
+	  x = getch();
+    /* Display a message on the screen */
+    printf("\nThe key you pressed was the %c key",x );
+  }
+  while ( x  != 'q' );
+
+	// All done :-)
+	
+  return 0;
+
+}

LC9/for_loops.c

@@ -0,0 +1,42 @@
+/*  Example Program */
+
+/*
+   This program shows how to write a simple loop that counts up
+   from zero to 9.
+
+   A second loop then counts from 10 down to 1
+
+   Remember
+
+	j++	means j = j + 1
+	j--	means j = j - 1
+
+*/
+
+#include <stdio.h>	/* Standard include files */
+#include <stdlib.h>
+
+
+int main(void)
+{
+
+  char j;		/* Define a variable of type integer */
+
+
+  /* The count up loop */
+  printf("\nCounting Up ... ");
+
+  for ( j = 0 ; j < 10 ; j++ )
+    printf("\nThe value of j is %d",j );
+
+
+  /* The count down loop */
+
+  printf ("\nCounting Down .. ");
+  for ( j = 10 ; j > 0 ; j-- )
+    printf("\nThe value of j is %d",j );
+
+
+  return 0;
+
+}

LC9/while_example_version_1.c

@@ -0,0 +1,47 @@
+/*
+   This program shows how to use a WHILE statment to keep displaying
+   the key pressed on the screen. It terminates when the 'q' key is
+   pressed
+
+
+*/
+
+#include <stdio.h>	/* Standard include files */
+#include <stdlib.h>
+#include <conio.h>
+
+
+int main( void )
+{
+
+  char x;		/* Define a variable of type char */
+
+  printf("Press a key ");
+  x = getch();		/* Use getch to read a keypress and store the */
+			/* result in 'x'. We do this initially so that */
+			/* there is a value in 'x' for the while statment */
+			/* to consider the first time round */
+
+  /* We now use the while statement. The 'loop' continues to execute */
+  /* until such time as the expression in the brackets becomes false */
+
+  /* we use != , meaning 'Not Equal to' as the test, as we wish the  */
+  /* the statements to be executed every time we press a key other   */
+  /* than 'q'. Once we press 'q' the code continues on to the next   */
+  /* statement */
+
+  while ( x != 'q' )
+  {
+    /* Display a message on the screen */
+    printf("\nThe key you pressed was the %c key\n",x );
+
+    /* Get a new value for X, if we do not the 'expression' will never */
+    /* change, and the loop will go for ever */
+
+    printf( "Press another key or q to quit \n");
+    x = getch();
+
+  }
+  return 0;
+
+}

LC9/while_example_version_2.c

@@ -0,0 +1,37 @@
+/*
+   This program shows how to use a WHILE statment to keep displaying
+   the key pressed on the screen. It terminates when the 'q' key is
+   pressed
+
+*/
+
+#include <stdio.h>	/* Standard include files */
+#include <stdlib.h>
+#include <conio.h>
+
+int main(void)
+{
+
+  char x;		/* Define a variable of type char */
+
+
+  /* We now use the while statement. The 'loop' continues to execute */
+  /* until such time as the expression in the brackets becomes false */
+
+  /* we use != , meaning 'Not Equal to' as the test, as we wish the  */
+  /* the statements to be executed every time we press a key other   */
+  /* than 'q'. Once we press 'q' the code continues on to the next   */
+  /* statement */
+
+  /* Note: This time the getch is in the while expression  */
+
+
+  while ( ( x = getch() ) != 'q' )
+  {
+    /* Display a message on the screen */
+    printf("\nThe key you pressed was the %c key",x );
+  }
+
+  return 0;
+
+}