Question

I know that Instance methods can return a value when they are done executing, but I do not know how to set & get that value, I know how to set the parameters but how do I set the return type of Method itself?

So, this is the Instance method implementation:

-(int) returnInteger: (id) anString: (int) anNumber{

to set it´s parameters i do:

 [self returnInteger: (id) returnNSString: (int) 100]; 

But how do I set the value of “returnInteger itself” I want to know how to set i both inside it´s implementation and when I call it (when it executes).

also – one more question

if I set it´s first parameter to be 100 inside the method, and when I call it I want to add 100 to it, how do i do that? i tried this -but did not work

[self returnInteger: (id) returnNSString: (int) + 100]; 

Answer 1

I’m still not really sure what you’re asking, but here’s an example that may be helpful.

@interface Juniper : NSObject
// Return type int, first parameter type NSString * and named s,
// second parameter type int and named i. Method's name is
// addNumberInString:toInt:
- (int)addIntInString: (NSString *)s toInt: (int)i;
@end

@implementation Juniper

- (int)addIntInString: (NSString *)s toInt: (int)i
{
    // Extract int from argument named s
    int intFromString = [s intValue];
    // Add that int to argument named i and end 
    // method, returning the result of addition
    return intFromString + i;
}

@end



int main(int argc, const char * argv[])
{

    @autoreleasepool {

        Juniper * j = [[Juniper alloc] init];
        // Execute the method, store the return value
        int result = [j addIntInString:@"100" toInt:15];
        // Display the return value so we know it worked.
        NSLog(@"%d", result);

    }
    return 0;
}