I have learned some basic Java, but now I want to learn Objective-C. Is there a tutorial or problem set of programs to make that I can follow to quickly learn the basics? Here is what I know how to do so far...

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) { //wants an int, 0=normal, 1=abnormal
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];//sets up memory pool for program

    // line type comment
    /* multi line type comment
    int a, b, mod; //can declare more than one
    int num = 8; a=2+1;
    NSLog(@"Hello!  Use %i for an integer", num); //@"string" is a constant NSString object
                                                    //"string" is a constant C-style string object
    NSLog (@"more than one %i %i", num, a);

    NSLog(@"carriage return\ntab\tsomething\nreversetab\rbleeeeeeeep\nbackspace\bbleep\nslosh\\");
    mod = 3%4;
    float var = 8.223; float var2 = 1.0;
    double g = 2.0;
    NSLog(@"%i %i %i %f %i", mod, 9%3, 5%2, var, fmod(var,var2) );//how to use fmod?
    NSLog(@"dunno for double", g);
    NSLog(@"%f %.f %.1f %.2f", var, var, var, var);

    NSString* formattedNumber = [NSString stringWithFormat:@"%.02f", var];
    NSString* stringy = @"we use a string variable here instead";   
    NSLog(stringy); //@"string" is an NSString object

    int input = 0, fib = 0, bib = 1, Total = 1;
    printf("How many numbers would you like to calculateHM?  "); //ask user input
    scanf("%d", &input);    // User input stored to int!

    // This loop calculates/prints the Fibonacci sequence.
    for (int i = 0; i < input; i++)
        printf("%d\n", Total);
        Total = fib + bib;
        fib = bib;
        bib = Total;

    [pool drain];//drains the memory pool
    return 0;//program ended normally

I am looking to learn string manipulation, arrays, how to create your own classes, and ultimately I want to create simple GUI in an iOS.

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