Charles Tritt / Mbed 2 deprecated FunctionPointers

Demonstrates the use of function pointers.

Dependencies:   mbed

main.cpp@0:f106e3c0c589, 2017-11-05 (annotated)

Committer:
CSTritt
Date:
Sun Nov 05 20:27:53 2017 +0000
Revision:
0:f106e3c0c589
Initial version. Based on Horton example 9.1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 0:f106e3c0c589 1 /*
CSTritt 0:f106e3c0c589 2 Project: FunctionPointer
CSTritt 0:f106e3c0c589 3 File: main.cpp
CSTritt 0:f106e3c0c589 4 Modified by: Dr. C. S. Tritt
CSTritt 0:f106e3c0c589 5 Last revised: 11/5/17 (v. 1.0)
CSTritt 0:f106e3c0c589 6
CSTritt 0:f106e3c0c589 7 Based on Horton Program 9.1 Pointing to functions.
CSTritt 0:f106e3c0c589 8 */
CSTritt 0:f106e3c0c589 9 #include "mbed.h"
CSTritt 0:f106e3c0c589 10
CSTritt 0:f106e3c0c589 11 // Function definitions (a.k.a., prototypes).
CSTritt 0:f106e3c0c589 12 int sum(int, int);
CSTritt 0:f106e3c0c589 13 int product(int, int);
CSTritt 0:f106e3c0c589 14 int difference(int, int);
CSTritt 0:f106e3c0c589 15
CSTritt 0:f106e3c0c589 16 int main(void)
CSTritt 0:f106e3c0c589 17 {
CSTritt 0:f106e3c0c589 18 int (*pfun)(int, int); // Local function pointer declaration.
CSTritt 0:f106e3c0c589 19 int a = 10; // Initial value for a.
CSTritt 0:f106e3c0c589 20 int b = 5; // Initial value for b.
CSTritt 0:f106e3c0c589 21
CSTritt 0:f106e3c0c589 22 pfun = sum; // pfun now points to function sum().
CSTritt 0:f106e3c0c589 23 int result = pfun(a, b); // Call sum() through pointer.
CSTritt 0:f106e3c0c589 24 printf("pfun = sum result = %d\n", result);
CSTritt 0:f106e3c0c589 25
CSTritt 0:f106e3c0c589 26 pfun = product; // pfun now points to function product().
CSTritt 0:f106e3c0c589 27 result = pfun(a, b); // Call product() through pointer.
CSTritt 0:f106e3c0c589 28 printf("pfun = product result = %d\n", result);
CSTritt 0:f106e3c0c589 29
CSTritt 0:f106e3c0c589 30 pfun = difference; // pfun now points to function difference().
CSTritt 0:f106e3c0c589 31 result = pfun(a, b); // Call difference() through pointer.
CSTritt 0:f106e3c0c589 32 printf("pfun = difference result = %2d\n", result);
CSTritt 0:f106e3c0c589 33
CSTritt 0:f106e3c0c589 34 while (true) wait(3600.0f); // Wait forever, over and over.
CSTritt 0:f106e3c0c589 35 }
CSTritt 0:f106e3c0c589 36
CSTritt 0:f106e3c0c589 37 // Function declarations...
CSTritt 0:f106e3c0c589 38 int sum(int x, int y)
CSTritt 0:f106e3c0c589 39 {
CSTritt 0:f106e3c0c589 40 return x + y;
CSTritt 0:f106e3c0c589 41 }
CSTritt 0:f106e3c0c589 42
CSTritt 0:f106e3c0c589 43 int product(int x, int y)
CSTritt 0:f106e3c0c589 44 {
CSTritt 0:f106e3c0c589 45 return x * y;
CSTritt 0:f106e3c0c589 46 }
CSTritt 0:f106e3c0c589 47
CSTritt 0:f106e3c0c589 48 int difference(int x, int y)
CSTritt 0:f106e3c0c589 49 {
CSTritt 0:f106e3c0c589 50 return x - y;
CSTritt 0:f106e3c0c589 51 }