Foundation Framework in Objective-C

Below is a summary of the key types and their respective subtypes offered by the Foundation framework:

Syntax and Keywords in Foundation Framework

Example 1: NSNumber Class

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSNumber *intNumber = @50;
        NSNumber *floatNumber = @4.56;
        NSNumber *boolNumber = @YES;

        // Comparing NSNumber objects
        if ([intNumber compare:floatNumber] == NSOrderedAscending) {
            NSLog(@"%@ is less than %@", intNumber, floatNumber);
        } else {
            NSLog(@"%@ is greater than or equal to %@", intNumber, floatNumber);
        }

        // Conversion to different types
        int intValue = [intNumber intValue];
        float floatValue = [floatNumber floatValue];
        BOOL boolValue = [boolNumber boolValue];

        NSLog(@"Converted values - int: %d, float: %.2f, bool: %d", intValue, floatValue, boolValue);
    }
    return 0;
}

Output:

50 is less than 4.56
Converted values - int: 50, float: 4.56, bool: 1

Example 2: NSString Class

#import <Foundation/Foundation.h>

int main(int argc, const char *argv[]) {
    @autoreleasepool {
        NSString *string1 = @"Foundation Framework";
        NSString *string2 = @"Objective-C Programming";

        // String Comparison
        if ([string1 isEqualToString:string2]) {
            NSLog(@"Both strings are equal.");
        } else {
            NSLog(@"Strings are not equal.");
        }

        // Conversion to uppercase
        NSString *uppercaseString = [string1 uppercaseString];
        NSLog(@"Uppercase: %@", uppercaseString);
    }
    return 0;
}

Output:

Strings are not equal.
Uppercase: FOUNDATION FRAMEWORK

Example 3: NSArray Class

#import <Foundation/Foundation.h>

int main(int argc, const char *argv[]) {
    @autoreleasepool {
        NSArray *fruits = @[@"Apple", @"Banana", @"Cherry"];
        NSArray *vegetables = @[@"Carrot", @"Spinach"];

        // Accessing elements
        NSLog(@"First fruit: %@", [fruits firstObject]);

        // Merging arrays
        NSArray *combinedArray = [fruits arrayByAddingObjectsFromArray:vegetables];
        NSLog(@"Combined array: %@", combinedArray);
    }
    return 0;
}

Output:

First fruit: Apple
Combined array: (
    Apple,
    Banana,
    Cherry,
    Carrot,
    Spinach
)