Objective-c the use of creating classes

Here is an example I wrote to test how Objective-c uses the class's

TestClass.h

  testclass.h//  testclass////  Created by exchen on 6/15/15.//  Copyright (c) exchen. All rights reserved.//#import <Foundation/Foundation.h> @interface testclass:nsobject{    //public member variable    @ public    int number1;    int number2;    NSString *nstr;    Char strarray[20];} member function declaration-(void) print;-(void) calc;-(nsstring*) Strappend: (nsstring*) string1: (nsstring*) string2; @end

Testclass.m

  testclass.m//  testclass////  Created by exchen on 6/15/15.//  Copyright (c) exchen. All rights reserved.//#import "TestClass.h" #import <stdio.h> @implementation testclass//member function implementation-(void) print{    printf ("%d\n", number1);    NSLog (NSTR);    printf ("%s\n", Strarray);} -(void) calc{    number1 + = number2;    printf ("%d\n", Number1);} -(nsstring*) Strappend: (nsstring*) string1: (nsstring*) string2{nsstring    *strret = [string1 STRINGBYAPPENDINGSTRING:STRING2];    return strret;} @end

Main.m

  main.m//  testclass////  Created by exchen on 6/15/15.//  Copyright (c) exchen. All rights reserved.//#import <Foundation/Foundation.h> #import "TestClass.h" int main (int argc, const char * argv[] {    @autoreleasepool {        //Insert code        here ... NSLog (@ "Hello, world!");    }        TestClass *TC = [[TestClass alloc] init];  allocating memory        tc->number1 = 1;  Assigning a value to a class member variable    tc->number2 = 2;    [TC Calc];       Call the class member function        strcpy (Tc->strarray, "Strarray");   Assigning a value to a class member string variable        [TC print];  Call the class member function        nsstring *strret = [TC strappend:@ "string1": @ "string2"];  Call a function with parameters    NSLog (strret);//print return value returned    0;}

Engineering

Objective-c the use of creating classes