From 66f005d0fd0c88a31b8c798243f090fe0090418c Mon Sep 17 00:00:00 2001 From: Paul Buetow Date: Mon, 30 Dec 2024 00:06:04 +0200 Subject: Update content for html --- ...20-object-oriented-programming-with-ansi-c.html | 71 +++++++++++----------- 1 file changed, 37 insertions(+), 34 deletions(-) (limited to 'gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html') diff --git a/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html b/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html index 790e9fff..82871d58 100644 --- a/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html +++ b/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html @@ -8,6 +8,9 @@ +

+View this page as Markdown | Gemtext +

Object oriented programming with ANSI C



Published at 2016-11-20T22:10:57+00:00; Updated at 2022-01-29
@@ -31,37 +34,37 @@ by Lorenzo Bettini http://www.lorenzobettini.it http://www.gnu.org/software/src-highlite --> -
#include <stdio.h>
+
#include <stdio.h>
 
-typedef struct {
-    double (*calculate)(const double, const double);
-    char *name;
-} something_s;
+typedef struct {
+    double (*calculate)(const double, const double);
+    char *name;
+} something_s;
 
-double multiplication(const double a, const double b) {
-    return a * b;
-}
+double multiplication(const double a, const double b) {
+    return a * b;
+}
 
-double division(const double a, const double b) {
-    return a / b;
-}
+double division(const double a, const double b) {
+    return a / b;
+}
 
-int main(void) {
-    something_s mult = (something_s) {
-        .calculate = multiplication,
-        .name = "Multiplication"
-    };
+int main(void) {
+    something_s mult = (something_s) {
+        .calculate = multiplication,
+        .name = "Multiplication"
+    };
 
-    something_s div = (something_s) {
-        .calculate = division,
-        .name = "Division"
-    };
+    something_s div = (something_s) {
+        .calculate = division,
+        .name = "Division"
+    };
 
-    const double a = 3, b = 2;
+    const double a = 3, b = 2;
 
-    printf("%s(%f, %f) => %f\n", mult.name, a, b, mult.calculate(a,b));
-    printf("%s(%f, %f) => %f\n", div.name, a, b, div.calculate(a,b));
-}
+    printf("%s(%f, %f) => %f\n", mult.name, a, b, mult.calculate(a,b));
+    printf("%s(%f, %f) => %f\n", div.name, a, b, div.calculate(a,b));
+}
 

 

 As you can see, you can call the function (pointed by the function pointer) with the same syntax as in C++ or Java:

@@ -70,8 +73,8 @@ http://www.gnu.org/software/src-highlite -->
 by Lorenzo Bettini
 http://www.lorenzobettini.it
 http://www.gnu.org/software/src-highlite -->
-
printf("%s(%f, %f) => %f\n", mult.name, a, b, mult.calculate(a,b));
-printf("%s(%f, %f) => %f\n", div.name, a, b, div.calculate(a,b));
+
printf("%s(%f, %f) => %f\n", mult.name, a, b, mult.calculate(a,b));
+printf("%s(%f, %f) => %f\n", div.name, a, b, div.calculate(a,b));
 

 

 However, that's just syntactic sugar for:

@@ -80,8 +83,8 @@ http://www.gnu.org/software/src-highlite -->
 by Lorenzo Bettini
 http://www.lorenzobettini.it
 http://www.gnu.org/software/src-highlite -->
-
printf("%s(%f, %f) => %f\n", mult.name, a, b, (*mult.calculate)(a,b));
-printf("%s(%f, %f) => %f\n", div.name, a, b, (*div.calculate)(a,b));
+
printf("%s(%f, %f) => %f\n", mult.name, a, b, (*mult.calculate)(a,b));
+printf("%s(%f, %f) => %f\n", div.name, a, b, (*div.calculate)(a,b));
 

 

 Output:

@@ -90,10 +93,10 @@ http://www.gnu.org/software/src-highlite -->
 by Lorenzo Bettini
 http://www.lorenzobettini.it
 http://www.gnu.org/software/src-highlite -->
-
pbuetow ~/git/blog/source [38268]% gcc oop-c-example.c -o oop-c-example
-pbuetow ~/git/blog/source [38269]% ./oop-c-example
-Multiplication(3.000000, 2.000000) => 6.000000
-Division(3.000000, 2.000000) => 1.500000
+
pbuetow ~/git/blog/source [38268]% gcc oop-c-example.c -o oop-c-example
+pbuetow ~/git/blog/source [38269]% ./oop-c-example
+Multiplication(3.000000, 2.000000) => 6.000000
+Division(3.000000, 2.000000) => 1.500000
 

 

 Not complicated at all, but nice to know and helps to make the code easier to read!

@@ -106,7 +109,7 @@ http://www.gnu.org/software/src-highlite -->
 by Lorenzo Bettini
 http://www.lorenzobettini.it
 http://www.gnu.org/software/src-highlite -->
-
mult.calculate(mult,a,b));
+
mult.calculate(mult,a,b));
 

 

 
Real object oriented programming with C


@@ -127,7 +130,7 @@ http://www.gnu.org/software/src-highlite -->
 

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