基本语法与数据类型

Objective-C Basics

Statements End with Semicolons

Explain Your Code with Comments

Primitive Data Types

Primitives in Action

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
  @autoreleasepool {
    int age = 30;
    float price = 19.99f; // 'f' for float literal
    double pi = 3.14159;
    char initial = 'J';
    BOOL isLoggedIn = YES;

    NSLog(@"Age: %i", age);
    NSLog(@"Price: %.2f", price);
    NSLog(@"Pi: %f", pi);
    NSLog(@"Initial: %c", initial);
    NSLog(@"Logged In: %@", isLoggedIn ? @"YES" : @"NO");
  }
  return 0;
}

Working with Text: NSString

NSString Example

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
  @autoreleasepool {
    NSString *greeting = @"Hello, CoddyKit!";
    NSString *name = @"Alice";
    NSString *message = [NSString stringWithFormat:@"Welcome, %@!", name];

    NSLog(@"Greeting: %@", greeting);
    NSLog(@"Personal Message: %@", message);
  }
  return 0;
}

Collections: NSArray

NSArray Example

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
  @autoreleasepool {
    // Array literal syntax
    NSArray *fruits = @[@"Apple", @"Banana", @"Cherry"];

    NSLog(@"First fruit: %@", fruits[0]); // Access by index
    NSLog(@"All fruits: %@", fruits);

    // Another way to create (older, but good to know)
    NSArray *colors = [NSArray arrayWithObjects:@"Red", @"Green", @"Blue", nil];
    NSLog(@"Colors: %@", colors);
  }
  return 0;
}

Quick Check on Types

Recap: Syntax & Data Types