Diff: main.cpp

Revision:

0:e9541fd79b08

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri May 24 22:17:09 2013 +0000
@@ -0,0 +1,30 @@
+/* Program Example 10.5: Pointers example for an array average function
+                                                                     */
+#include "mbed.h"
+Serial pc(USBTX, USBRX);                               // setup serial comms
+char data[]={5,7,5,8,9,1,7,8,2,5,1,4,6,2,1,4,3,8,7,9}; //define some input data
+char *dataptr;                           // define a pointer for the input data
+float average;                           // floating point average variable
+
+float CalculateAverage(char *ptr, char size);     // function prototype
+
+int main() {    
+  dataptr=&data[0];       // point pointer to address of the first array element
+  average = CalculateAverage(dataptr, sizeof(data));      // call function
+  pc.printf("\n\rdata = ");
+  for (char i=0; i<sizeof(data); i++) {           // loop for each data value
+    pc.printf("%d ",data[i]);                     // display all the data values
+  }
+  pc.printf("\n\raverage = %.3f",average);        // display average value
+}
+
+     // CalculateAverage function definition and code 
+float CalculateAverage(char *ptr, char size) {
+  int sum=0;                // define variable for calculating the sum of the data
+  float mean;               // define variable for floating point mean value
+  for (char i=0; i<size; i++) {
+    sum=sum + *(ptr+i);            // add all data elements together
+  }
+  mean=(float)sum/size;            // divide by size and cast to floating point
+  return mean;             
+}