Diff: main.cpp

Revision:

0:f4431aea05f2

Child:

1:66b36106613a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 03 02:19:44 2017 +0000
@@ -0,0 +1,27 @@
+/*
+    Project: PointerPlay
+    File: main.cpp
+
+    Demonstrates some uses of pointers.
+
+    Written by: Dr. C. S. Tritt
+    Created: 9/24/17 (v. 1.0)
+
+*/
+#include "mbed.h"
+
+int main() {
+    printf("\nPointer Play -- \"a is a.\"\n");
+    // Each set of lines below create a variable and a pointter to it.
+    float myNum1 = 1.23f; // Initialize the variable.
+    float* pNum1 = &myNum1; // Initialize the pointer to point to it.
+    printf("myNum1 is %f and *pNum1 is %f.\n", myNum1, *pNum1);
+    int myNum2; // Create a variable.
+    int* pNum2 = NULL; // Create a NULL (unassigned) pointer.
+    pNum2 = &myNum2; // Put the address in the pointer.
+    *pNum2 = 15; // Dereference the pointer to store a value.
+    printf("myNum2 is %d and *pNum2 is %d.\n", myNum2, *pNum2);
+    // Examine the addresses (pointer values).
+    printf("pNum1 is %p and pNum2 is %p.\n", pNum1, pNum2);
+    while(true); // Wait here forever.
+}
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