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iphone Hello World in Objective C

by Farooq Kaiser 28. June 2009 03:45

As i have mentioned in my previouse article that All iPhone development is done in objective-c.

Today i will start with a simple program using command line.

$ cat helloworld.h

1- #import <Foundation/Foundation.h>

2- int main (int argc, const char *argv[])
3- {
4- NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
5- NSLog (@"Hello World!");
6- [pool drain];
7- return 0;
8- }

compiling and running:

$ gcc -framework Foundation helloworld.m
$ ./a.out

Hello World!

Now we will understand the above code. Line numbers are for reference.

Line 1 include the base class

Line 4 declared for memory management. Reserves space in memory.

Line 5 NSLog is a function that displays the argument you pass in.

Line 6 Release the allocated memory pool

Line 7 Terminate the execution of main.

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Tags: iphone, objective-c, xcode

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iphone Hello World in Objective C

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