Comments in NS prefix \OC \ Access functions in OC Original file, c original file

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NS Prefix

NS a software from NeXTSTEP NeXT software

Namespaces not supported in OC (namespace)

NS is a prefix that is given to avoid naming conflicts

See the NS prefix to know the name of the system class in cocoa

How to use "@"

1, @ "" is a symbol that converts a string in C to a string object in OC

2, the @ symbol OC Most of the keywords are at the beginning of the @, such as @interface

@[email protected] @class

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Comments in OC

1) Single-line comment://

2) Multi-line Comment:/* */

No comments are processed when the program is compiled

Note You can appear in most of the program's locations.

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Access to functions in OC Original file, c original file

Oc.m

//

Main.m

Hello World

//

Created by Angel on 15-7-14.

Copyright (c) year Angel. All rights reserved.

//

#import <Foundation/Foundation.h>

void Test_oc () {

printf(" i am a function of OC");

NSLog(@ " i am nslog\n");

}

Main.m

int Main (int argc, const Char * argv[])

{

@autoreleasepool {

//Insert code here ...

//nslog (@ "Hello, world!");

// usage

NSLog(@ "This is a Test"); // Print a string

nsstring *str=@ "Hello iphone";

NSLog(@ "string is:%@", str); use a placeholder,%@ to print an object

NSLog (@ "a=%d,b=%d",ten);

}

return 0;

}

TEST.c

//

TEST.c

Hello World

//

Created by Angel on 15-7-14.

Copyright (c) 2015 Angel. All rights reserved.

//

#include "test.h"

void Test_c ()

{

printf ("I am C function");

}

Oc.h

//

Oc.h

Hello World

//

Created by Angel on 15-7-14.

Copyright (c) 2015 Angel. All rights reserved.

//

#ifndef Hello_world_oc_h

#define Hello_world_oc_h

void Test_oc ();

#endif

Test.h

//

Test.h

Hello World

//

Created by Angel on 15-7-14.

Copyright (c) year Angel. All rights reserved.

//

#ifndef Hello_world_test_h

#define Hello_world_test_h

Test_c () function declaration

#include<stdio.h>

#endif

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Comments in NS prefix \OC \ Access functions in OC Original file, c original file