OC Basics Review 01-First OC Program

Recent brief review under OC Open iterm Tool Input command

mkdir Reviewoc

Open Sublime text file

Open-a sublime\ Text

Write the following code:

1 #include <stdio.h>2//main entry for all Programs  haha, not here. 3int Main () 4 {5     printf ("Hello OC \ n"); 6 }

Save As REVIEW01.M

Compile files in the Reviewoc directory cc-c review01.m

File without errors directly produces a REVIEW01.O file

Then execute the CC REVIEW01.O file

Generate executable file a.out

Execute command:./a.out

See the results as follows:

Correct output ha

It's still written in C, so now let's write an OC review02.m.

1 /**2 #import role 1: Copy the contents of the right file 2: can automatically prevent the contents of the file is repeated copy3  */4 #import<Foundation/Foundation.h>5 6 intMainintargcConst Char*argv[]) {7 @autoreleasepool {8         //Insert code here ...9NSLog (@"Hello, Real OC!");Ten     } One     return 0; A}

Error when executing cc REVIEW02.O command

Do you know what it is? Because our OC program introduces the foundation framework and therefore requires a compiler when linking, the framework I use is the foundation

CC Review02.o-framework Foundation

It's going to be all right, huh?

OC Basics Review 01-First OC Program