Revision 5:eb5c6ae5938b, committed 2013-11-26

Comitter:

jf1452

Date:

Tue Nov 26 11:18:11 2013 +0000

Parent:

4:c4e451a1890f

Commit message:

Pointer Example

Changed in this revision

diff -r c4e451a1890f -r eb5c6ae5938b main.cpp
--- a/main.cpp	Tue Nov 26 09:52:16 2013 +0000
+++ b/main.cpp	Tue Nov 26 11:18:11 2013 +0000
@@ -1,5 +1,5 @@
 /*******************************************************************************
-* This program demonstrates the use of enumeration                             *
+* This program demonstrates the use of pointers                                *
 *                                                                              *
 * Jon Fuge                                                                     *
 * V1.0 25/11/2013 First issue of code                                          *
@@ -8,16 +8,23 @@
 #include "mbed.h"
 #include "USBSerial.h"
 
-enum DaysOfTheWeek { SUN , MON, TUE, WED, THUR, FRI, SAT };
-enum MonthsOfTheYear { JAN = 1, FEB, MAR, APR, MAY, JUN,\
-                       JUL, AUG, SEP, OCT, NOV, DEC};
-
 USBSerial serial; // Virtual serial port over USB. Use Teraterm as the interface
 
 int main() {
-   wait (10); // Wait 10 seconds to connect port
+   char cBox1 = 5;
+   char cBox2 = 10;     // Declare two variables.
+   char *ptr  = &cBox1; // Declare a pointer directed to cBox1
+   
+   wait (10);           // Wait 10 seconds to connect port
+
+   serial.printf("cBox1:%i, cBox2:%i, *ptr:%i\n\r", cBox1, cBox2, *ptr);
 
-   serial.printf("Sunday is day %i, April is the %i month of the year\n\r", SUN, APR);
+   cBox2 = cBox1;       // cBox2 was 10, but is now 5
+   serial.printf("cBox1:%i, cBox2:%i, *ptr:%i\n\r", cBox1, cBox2, *ptr);
+   
+   cBox1 = 15;          // cBox1 was 5, but is now 15
+   serial.printf("cBox1:%i, cBox2:%i, *ptr:%i\n\r", cBox1, cBox2, *ptr);
+   // cBox2 will still report 5, but *ptr now reports 15
 
-   for(;;) {} // Loop forever
+   for(;;) {}           // Loop forever
 }
\ No newline at end of file