Hello World in the Objective-c

Objective-c on the basis of C language, added some of their own unique features, and in Objective-c compatible with the original C language usage. In Objective-c, there is a certain difference between implementing Hello World and C, as follows:

#import <Foundation / Foundation.h> // Find the header file in the Foundataion framework Foundation.h header file
int main (int argc, const char * argv []) {
     // In object-c, use the function NSLog function to output
     NSLog (@ "Hello World!");
     // @ indicates that the string inside the quotes needs to be treated as an NSString element in Cocoa
     // NSLog function will automatically add a timestamp, and automatically add a newline character
} 

Hello World in the Objective-c