CODEWITHSUNDEEP
objective-clinux
JomanJi
JomanJi

Reputation: 1417

Random Number Objective-C (linux)

Now, I know that this is a simple question for MacOS, but when I compile a code with 'arc4random % n' in it, I just get an error log in Terminal saying:

main.m:9: error: ‘arc4random’ undeclared (first use in this function)
main.m:9: error: (Each undeclared identifier is reported only once
main.m:9: error: for each function it appears in.)

and I use:

gcc `gnustep-config --objc-flags` -lgnustep-base main.m -o main

to compile it

and here's my code (if it helps) :

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
        NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

        int number, guess;

    number = arc4random() % 101;

    while (!guess == number) {  
        NSLog (@"Please guess a number between 1 and 100");
        scanf ("%i", &guess);

        if  (guess < number) {
            NSLog (@"Sorry, guessed too low!");
        }

        else if (guess > number) {
            NSLog (@"Sorry, guessed too high!");
            }
    }

        NSLog (@"You guessed correct!");

        [pool drain];
        return 0;
}

Upvotes: 1

Views: 598

Answers (2)

Gabriele Petronella
Gabriele Petronella

Reputation: 108169

You may consider using clang instead of gcc

Use 

clang -fno-objc-arc main.m -framework Foundation -o main

Also I'd use arc4random_uniform(101) instead of arc4random() % 101, since the former is bias free.

Upvotes: 2

WDUK
WDUK

Reputation: 19030

A few things:

  1. Your use of >> and <<, these are not valid comparison operators. This will compile, but not perform what you expect. You either need to use > (greater than), >= (greater than or equals), < (less than) or <= (less than or equals).

  2. Your compile error is due to your use of arc4random. This is a function, but you've not used it as such. You need to change your line to

    number = arc4random() % 101;

  3. Not 100% sure on this, but %i in your scanf looks like it should be %d

Upvotes: 2

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