Question

I’ve dived into learning Objective-C and hit a little snag in when calling a method. Here’s my simple code snippets:

Player.h code snippet:

@interface Player : NSObject{


}

-(void) performAction;
-(int) addNumber:(int) a toNumber:(int) b;

@end

Player.m code snippet:

@implementation Player

-(void)performAction{
    NSLog(@"Here it is!");
}

-(int)addNumber:(int)a toNumber:(int)b{
    return a+b;

}


@end

Calling method from main.m:

int val = [playerOne addNumber:(int)3 toNumber:(int)3];

In the above line of code, i keep getting an ‘Expected expression’ error.

Any ideas ?

Answer 1

This code works for me.

Player.h

#import <Foundation/Foundation.h>

@interface Player : NSObject

- (void)performAction;
- (int)addNumber:(int)a toNumber:(int)b;

@end

Player.m

#import "Player.h"

@implementation Player

- (void)performAction {
    NSLog(@"Here it is!");
}

- (int)addNumber:(int)a toNumber:(int)b {
    return a+b;
}

@end

main.m

#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import "Player.h"

int main(int argc, char *argv[])
{
    @autoreleasepool {
        Player *playerOne = [Player new];
        int val = [playerOne addNumber:(int)3 toNumber:(int)3];

        NSLog(@"%d", val);


        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}